Question:
Solve -5 = 95*u - 94*u + 6 for u..

Answer:
-11

Question:
Solve -153*f + 618 = -759 for f..

Answer:
9

Question:
Solve -23502*k + 286 = -23524*k for k..

Answer:
-13

Question:
Solve -111*f - 1217 = 559 for f..

Answer:
-16