Question:
Solve -925 = -91*p + 492 - 871 for p..

Answer:
6

Question:
Solve 187*c - 1520 = -3*c for c..

Answer:
8

Question:
Solve 40*r - 180 - 171 = 209 for r..

Answer:
14

Question:
Solve 7*h + 22 = 64 for h..

Answer:
6