Question:
Solve -131 = -135*b + 409 for b..

Answer:
4

Question:
Solve -1476*s = 40088 - 1712 for s..

Answer:
-26

Question:
Solve -127*r - 1256 = -284*r for r..

Answer:
8

Question:
Solve 336*z = -956*z - 1972*z + 342720 for z..

Answer:
105