#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int TESTS = 1;     cin >> TESTS;     while (TESTS--) {       long long n, x, y, d;       cin >> n >> x >> y >> d;       if (abs(y - x) % d == 0) {         cout << abs(y - x) / d <<   n ;         continue;       }       long long l = 1000000007, r = 1000000007;       if ((n - y) % d == 0) {         l = (n - y) / d + (n - x + d - 1) / d;       }       if ((y - 1) % d == 0) {         r = (y - 1) / d + (x - 1 + d - 1) / d;       }       long long ans = min(l, r);       if (ans != 1000000007)         cout << ans <<   n ;       else         cout <<  -1 n ;     }     return 0;   }   