Question:
Solve -2*t = -21 + 15 for t..

Answer:
3

Question:
Solve 0 = -677*w + 682*w - 40 for w..

Answer:
8

Question:
Solve 53*f = -1152 + 357 for f..

Answer:
-15

Question:
Solve 82*o = 8846 - 8026 for o..

Answer:
10