#include <iostream>
#include <fstream>
using namespace std;

char equation[1000];

void handle(char *s){
	int slen=strlen(s);

	int fx=0,count=0;//fx=x的系数，count=值的大小
	int lr=1; //左边还是右边的等式。
	int pn=1; //当前是正还是负

	char a[100];//保存临时的数值
	int aj=0;int i=0;
	while(s[i]!='\0'){
		if(s[i]=='='){
			a[aj]='\0';
			int p=lr*pn*atoi(a);
			count+=p;
			lr=-1;
			pn=1;
			aj=0;
		/*	cout<<fx<<" "<<count<<endl;
			return;*/
		}else if(s[i]=='-'){
			a[aj]='\0';
			int p=lr*pn*atoi(a);
			count+=p;
			pn=-1;
			aj=0;
		}else if(s[i]=='+'){
			a[aj]='\0';
			int p=lr*pn*atoi(a);
			count+=p;
			pn=1;
			aj=0;
		}else if(s[i]=='x'){
			a[aj]='\0';			
			int p=lr*pn*atoi(a);
			fx+=p;
			aj=0;
		}else{
			if(s[i]>='0'&&s[i]<='9'){
				a[aj++]=s[i];
			}
		}
		i++;
		if(s[i]=='\0'&&s[i-1]!='x'){
			a[aj]='\0';
			int p=lr*pn*atoi(a);
			count+=p;
		}
	}
	if(count==0&&fx==0){
		cout<<"IDENTITY"<<endl;
	}else if(count!=0&&fx==0){
		cout<<"IMPOSSIBLE"<<endl;
	}else{
		int result=0;
		float n=(float)(-1*count)/fx;
		if(n>=0)result=(int)n;
		else result=(int)n-1;
		cout<<result<<endl;
	}

}


void main(){
	int testcase;
	cin>>testcase;
	for(int i=0;i<testcase;i++){
		cin>>equation;
		handle(equation);
	}
}