Q: What is the solution?
Solve -71158 + 3185 = 2986*b + 42509 for b.

A: -37

Q: What is the solution?
Solve 3621 = -10*s + 3621 for s.

A: 0

Q: What is the solution?
Solve -528 = 99*r + 759 for r.

A:
-13