Question:
Solve -1508 = -7*v - 1571 for v..

Answer:
-9

Question:
Solve -30 = 20*p - 10 for p..

Answer:
-1

Question:
Solve -20*f + 31910 - 31590 = 0 for f..

Answer:
16

Question:
Solve -109*b - 3302 - 5875 = -1002 for b..

Answer:
-75