Q: Solve:
Solve -77*z = -19*z - 290 for z.

A: 5

Q: Solve:
Solve 16666631*s - 1050 = 16666606*s for s.

A: 42

Q: Solve:
Solve 206*n - 476 - 604 = 326*n for n.

A:
-9