quadraticEquation Solver Code Needs Revesiting

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace QuadraticEquationSolver
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                double x1 = 0;
                double x2 = 0;
                double delta = 0;
                int a = 0;
                int b = 0;
                int c = 0;
                char[] aBC = new char[1000];
                Console.WriteLine("\nEquation must be entered in the following format: ax^2+bx+c=0. It is extremely\nimportant, because otherwise the program won't be able to run the neccesary\ncalculations. If b=0, type 'ax^2+0x+c', if c=0, type 'ax^2+bx+0'.\n");
                string equation = Console.ReadLine();
                for (int i = 0; i < equation.Length; i++)
                {
                    if (equation[i] == 'x' && i == 0 || (equation[i] == '-' && equation[i + 1] == 'x' && i == 0))
                    {
                        aBC[i] = '1';
                        a = 0;
                        break;
                    }
                    if (equation[i] == 'x' && i != 0)
                    {
                        a = i - 1;
                        break;
                    }
                    aBC[i] = equation[i];
                }
                if (a != 0)
                    for (int i = a + 5; i < equation.Length; i++)
                    {
                        if (equation[i] == 'x')
                        {
                            b = i - 1;
                            break;
                        }
                        aBC[i] = equation[i];
                    }
                else
                    for (int i = a + 4; i < equation.Length; i++)
                    {
                        if (equation[i] == 'x')
                        {
                            b = i - 1;
                            break;
                        }
                        aBC[i] = equation[i];
                    }
                for (int i = b + 3; i < equation.Length; i++)
                {
                    if (equation[i] == '=')
                    {
                        c = i - 1;
                        break;
                    }
                    else if (equation[equation.Length - 1] != '=' && i == equation.Length - 1)
                        c = equation.Length;
                    aBC[i] = equation[i];
                }
                string strA = "";
                string strB = "";
                string strC = "";
                for (int i = 0; i <= c; i++)
                {
                    if (i <= a)
                        strA += aBC[i];
                    else if (i <= b && i >= a + 5 && a != 0)
                        strB += aBC[i];
                    else if (i <= b && i >= a + 4 && a == 0)
                        strB += aBC[i];
                    else if (i >= b + 3)
                        strC += aBC[i];
                }
                int aNew = Convert.ToInt32(strA);
                if (equation[0] == '-' && equation[1] == 'x')
                    aNew = -1;
                int bNew = Convert.ToInt32(strB);
                if (equation[a + 4] == '-' || equation[a + 3] == '-')
                    bNew = -bNew;
                int cNew = Convert.ToInt32(strC);
                if (equation[b + 2] == '-' || equation[b + 1] == '-')
                    cNew = -cNew;
                Console.WriteLine("a=" + aNew + "\nb=" + bNew + "\nc=" + cNew);
                quadraticEquation(aNew, bNew, cNew, ref x1, ref x2, ref delta);
                if (x1 == x2)
                {
                    if (x1 != delta)
                        Console.WriteLine("\nx = " + x1);
                    if (x1 == delta)
                        Console.WriteLine("No solution over the reals.");
                }
                else
                    Console.WriteLine("\nx1 = " + x1 + "\nx2 = " + x2);
            }
        }
        static void quadraticEquation(double aNew, double bNew, double cNew, ref double x1, ref double x2, ref double delta)
        {
            delta = Math.Pow(bNew, 2) - 4 * aNew * cNew;
            if (delta >= 0)
            {
                x1 = (-bNew + Math.Sqrt(delta)) / (2 * aNew);
                x2 = (-bNew - Math.Sqrt(delta)) / (2 * aNew);
            }
            else
                x1 = x2 = delta;
        }
    }
}