Q: What is the solution?
Solve -39220 = -820*r - 1493*r - 9*r + 39728 for r.

A: 34

Q: What is the solution?
Solve 18*s = 14*s for s.

A: 0

Q: What is the solution?
Solve 178*b - 388*b + 76 = -172*b for b.

A:
2