Q: Solve:
Solve 56*c = 52*c - 16 for c.

A: -4

Q: Solve:
Solve 0 = -7563*f + 15216*f - 7605*f - 720 for f.

A: 15

Q: Solve:
Solve -67*x - 38460 = -214*x + 1429*x for x.

A:
-30