Question:
Solve 0 = 9*f - 33*f - 72 for f..

Answer:
-3

Question:
Solve -534*x - 119*x + 12608 = 135*x for x..

Answer:
16

Question:
Solve 84*u - 646 - 278 = 0 for u..

Answer:
11

Question:
Solve 2*y = 20 - 12 for y..

Answer:
4