qwertyj

#include <bits/stdc++.h>

using namespace std;
ifstream fin("ecuatii2.in");
ofstream fout("ecuatii2.out");

char s[255];
int n;

void rezolvare(char s[])
{
    int i=0,coef1=0,coef2=0,semn=1,x=-1;
    while(s[i]!='=')
    {
        if(s[i]=='-')
        {
            semn=-1;
            i++;
        }
        else if(s[i]=='+')
        {
            semn=1;
            i++;
        }
        else if(s[i]>='0' && s[i]<='9')
        {
            x=0;
            while(s[i]>='0' && s[i]<='9')
            {
                x=x*10+s[i]-'0';
                i++;
            }
            if(s[i]=='x')
            {
                coef1+=semn*x;
                i++;
            }
            else
                coef2+=semn*x;
            semn=1;
            x=-1;
        }
        else if(s[i]=='x')
        {
            coef1+=semn;
            i++;
        }
    }
    i++;
    semn=-1;
    while(s[i])
    {
        if(s[i]=='-')
        {
            semn=1;
            i++;
        }
        else if(s[i]=='+')
        {
            semn=-1;
            i++;
        }
        else if(s[i]>='0' && s[i]<='9')
        {
            x=0;
            while(s[i]>='0' && s[i]<='9')
            {
                x=x*10+s[i]-'0';
                i++;
            }
            if(s[i]=='x')
            {
                coef1+=semn*x;
                i++;
            }
            else
                coef2+=semn*x;
            semn=-1;
            x=1;
        }
        else if(s[i]=='x')
        {
            coef1+=semn;
            i++;
        }
    }
    if(coef1==coef2 && coef1==0)
        fout<<"infinit\n";
    else if(coef1==0)
        fout<<"imposibil\n";
    else
    {
        double sol=-1.0*coef2/coef1;
        fout<<setprecision(4)<<fixed<<sol<<"\n";
    }
}

int main()
{
    fin>>n;
    while(n)
    {
        fin>>s;
        rezolvare(s);
        n--;
    }
    return 0;
}