#include <bits/stdc++.h>
#include <ios>
#define ll long long int
#define ii pair<int, int>
#define ff first
#define ss second
#define vi vector<ll>
#define lli long long
#define vii vector<ii>
#define pb push_back
#define fast_io                                                                \
  ios_base::sync_with_stdio(0);                                                \
  cin.tie(0);                                                                  \
  cout.tie(0);
using namespace std;

const int N = 2e5;
const ll MOD = 1e9 + 7;

ll fpow(ll base, ll e) {
  ll ans = 1;
  while (e) {
    if (e & 1) {
      ans = (ans * base) % MOD;
    }
    base = (base * base) % MOD;
    e >>= 1;
  }
  return ans;
}

int main() {
  int tc;
  cin >> tc;
  while (tc--) {
    ll n, c;
    cin >> n >> c;
    ll res = (2 * fpow(c,n));
    res = (res - c + MOD) % MOD;
    cout<<res<<endl;
  }
  return 0;
}