Question:
Solve 6*o + 3*o = 36 for o..

Answer:
4

Question:
Solve 0 = 11*o - 15*o - 4 for o..

Answer:
-1

Question:
Solve -2384*s - 5800 + 129768 = 0 for s..

Answer:
52

Question:
Solve -14*f + 21 + 49 = 0 for f..

Answer:
5