#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main(){
    int t;
    cin >> t;
    cin.ignore();
    while (t--) {
        string s;
        getline(cin, s);
        int a = (int)(s[0] - 48);
        int b = (int)(s[4] - 48);
        int c = (int)(s[8] - 48);
        if(a+b==c){
            cout << "YES" << endl;
        }else{
            cout << "NO" << endl;
        }
    }
    return 0;
}