#include <bits/stdc++.h>
using uint = unsigned int;
using cat = long long;
using dbl = long double;
constexpr dbl pi = 3.14159265358979323846;
using namespace std;
template <typename T>
T abs(T x) {
  return (x < 0) ? (-x) : x;
}
cat pw(cat a, cat e, cat mod) {
  if (e <= 0) return 1;
  cat x = pw(a, e / 2, mod);
  x = x * x % mod;
  return (e & 1) ? x * a % mod : x;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cout << fixed << setprecision(10);
  int T;
  cin >> T;
  while (T--) {
    int N;
    cin >> N;
    vector<cat> A(N);
    cat S = 0;
    for (int i = 0; i < N; i++) {
      cin >> A[i];
      S += A[i];
    }
    if (S % N != 0) {
      cout << "-1\n";
      continue;
    }
    vector<vector<cat> > ops;
    for (int i = 1; i < N; i++) {
      if (A[i] % (i + 1) != 0) {
        cat x = i + 1 - A[i] % (i + 1);
        ops.push_back({1, i + 1, x});
        A[i] += x;
        A[0] -= x;
      }
      ops.push_back({i + 1, 1, A[i] / (i + 1)});
    }
    for (int i = 1; i < N; i++) ops.push_back({1, i + 1, S / N});
    cout << ops.size() << "\n";
    for (auto op : ops) cout << op[0] << " " << op[1] << " " << op[2] << "\n";
  }
}
