Q: Solve -12 = 3*f + 9*f for f.

A: -1

Q: Solve -16*r = 258*r - 4381 + 9861 for r.

A: -20

Q: Solve 8*h - 26 = -2 for h.

A: 3

Q: Solve 166*z + 215 = -117 for z.

A:
-2