Q: What is the solution?
Solve -2*o - o - 158 + 161 = 0 for o.

A: 1

Q: What is the solution?
Solve 147*c - 49 = 140*c for c.

A: 7

Q: What is the solution?
Solve -850 = -8*f - 810 for f.

A:
5