Q: Solve:
Solve 129*d = 79 + 179 + 387 for d.

A: 5

Q: Solve:
Solve -9*i + 12 = -12*i for i.

A: -4

Q: Solve:
Solve 112*n - 151*n + 16962 = -193*n - 1980 for n.

A:
-123