BinomialEqualitiesGenerator -TizzyT

using System;

namespace BinomialEqualitiesGenerator
{
    class Program
    {
        private static Random RND = new Random();

        static void Main(string[] args)
        {
            while (true)
            {
                int Difficulty;

                do
                {
                    Console.WriteLine("Choose a difficulty between 10 and " + ushort.MaxValue + " (inclusive)");
                } while (!(int.TryParse(Console.ReadLine(), out Difficulty) && Difficulty >= 10 && Difficulty <= ushort.MaxValue));

                int X = RND.Next(1, Difficulty);
                int Y = RND.Next(1, Difficulty);

                int LeftX = RND.Next(1, Difficulty);
                int LeftY = RND.Next(1, Difficulty);

                int RightX = RND.Next(1, Difficulty);
                int RightY = RND.Next(1, Difficulty);

                int LeftConst = RND.Next(((X + Y) / 2) * -1, (X + Y) / 2);

                int LeftValue = (LeftX * X) + (LeftY * Y) + LeftConst;
                int RightValue = (RightX * X) + (RightY * Y);

                int RightConst = LeftValue - RightValue;

                Console.WriteLine(LeftX + "x+" + LeftY + "y" + (LeftConst > 0 ? "+" : "") + LeftConst + "=" + RightX + "x+" + RightY + "y" + (RightConst > 0 ? "+" : "") + RightConst);
            }
        }
    }
}