Solve 120 = 30*j + 10*j for j.
Solve this plz.

A: 3

Solve 0 = 57276*r - 57269*r + 9 + 12 for r.
Solve this plz.

A: -3

Solve -3362*n - 1090 = -681*n - 84201 for n.
Solve this plz.

A:
31