#include <iostream>
#include <cstdlib>
#include <vector>
#include <cstring>
#include <cmath>
#include <string> 

using namespace std;

void ltoi( string &str ,int &x,int &num);
int numlen( char *cstr );

const double LIMIT=0.000001;

int main(){
    int a = 0;
    int line;
    cin >> line;
    while( a < line && line <=10 && line >= 1 ){
           int n;
           int len;
           string str;
           double ans = 0;
           vector<int> num;
           vector<int> x;
           int num_t = 0 ,x_t = 0;
           getline( cin ,str );
           while( str[ 0 ] != '=' ){
                  int x1 = 0 ,num1 = 0;
                  ltoi(str,x1,num1);
                  if( x1 )
                      x.push_back(-x1);
                  if( num1 )
                      num.push_back(-num1);
                  if( str[ 0 ] =='+' )
                      str =str.substr(1);
           }     
           str = str.substr(1);
           while( str[ 0 ] ){
                  int x1 = 0 ,num1 = 0;
                  ltoi(str,x1,num1);
                  if( x1 )
                      x.push_back(x1);
                  if( num1 )
                      num.push_back(num1);
                  if( str[ 0 ] =='+' )
                      str =str.substr(1);
                  }
           for( int i = 0 ;i < x.size(); i++ )
                x_t += x[ i ];
           for( int i = 0 ;i < num.size(); i++ )
                num_t += num[ i ];
           if( x_t == 0 ){
               if( num_t== 0 )
                   cout << "IDENTITY";
               else
                   cout << "IMPOSSIBLE";
                   }
           else{
               ans = -num_t/x_t;
               if(fabs(ans)<LIMIT) 
                  cout << 0;
               else
                  cout << floor(ans);
                  }
           cout << endl;             
           }
    return 0;
}

void ltoi( string &str ,int &x,int &num){
    int n,len;
    char str1[255];
    if( str[ 0 ] == 'x' ){
        n = 1;
        str = str.substr(1);
        x = 1;
        }
    else if( str[ 0 ] == '-' && str[ 1 ] == 'x' ){
        n = -1;
        str = str.substr(2);
        x = -1;
        }
    else{
        n = atoi(str.c_str());
        sprintf(str1,"%d",n);
        len = numlen(str1);
        if( str[ len ] == 'x' ){
            x = n;
            str = str.substr(len+1);
            }
        else{
             num = n;
             str = str.substr(len);
             }
        }
}

int numlen( char *cstr ){
    int i;
    for( i = 0 ;cstr[ i ] ; i++ );
    return i;
}