#include<iostream>
#include<string.h>
using namespace std;
char a[300];
void fun()
{
	int i,len,num=0,z=0,temp=0,p=1,q=1,k;
	double d;
	len=strlen(a);
	if(a[0]=='x') z=1;
	for(i=0;i<len;++i)
	{
		if('0'<=a[i]&&a[i]<='9') 
		{
			
			temp=temp*10+a[i]-'0';
			if(i==len-1)
			{
				num+=temp*q*p;
			}
			continue;
		}
		if(a[i]=='x'&&i!=0)
		{
			if(temp==0)
				z+=1*p*q;
			else
				z+=temp*p*q;
			temp=0;
			p=1;
			continue;
		}

		if(a[i]=='+'&&a[i-1]!='x') 
		{
			num+=temp*p*q;
			temp=0;
			p=1;
			continue;
		}
		if(a[i]=='-'&&a[i-1]!='x')
		{
			num+=temp*p*q;
			temp=0;
			p=-1;
			continue;
		}
		if(a[i]=='+'&&a[i-1]=='x') 
		{
			z+=temp*p*q;
			temp=0;
			p=1;
			continue;
		}
		if(a[i]=='-'&&a[i-1]=='x')
		{
			z+=temp*p*q;
			temp=0;
			p=-1;
			continue;
		}
		if(a[i]=='=')
		{
			if(a[i-1]=='x')
				z+=temp*p*q;
			else
				num+=temp*p*q;
			q=-1;
			temp=0;
			continue;
		}
	}
	num=(-1)*num;
	if(z==0)
	{
		if(num==0) printf("IDENTITY\n");
        else  printf("IMPOSSIBLE\n");
	}
	else
	{
		k=num/z;
		d=(double)num/(double)z;
		if(k>d) printf("%d\n",k-1);
		else printf("%d\n",k);
	}   

}

int main()
{
	//freopen("in.txt","r",stdin);
	int t;
	scanf("%d",&t);
	while(t--)
	{
		memset(a,'0',sizeof(char));
	    scanf("%s",a);
		fun();
	}
	return 0;
}