Q: What is the solution?
Solve 0 = -4*o + 9*o + 20 for o.

A: -4

Q: What is the solution?
Solve 2494 = -c + 2505 for c.

A: 11

Q: What is the solution?
Solve -23758 + 20198 = -178*b for b.

A:
20