Q: What is the solution?
Solve -r = 5 - 5 for r.

A: 0

Q: What is the solution?
Solve 457*f - 3 - 3 = 454*f for f.

A: 2

Q: What is the solution?
Solve 2*h + 7*h - 36 = 0 for h.

A:
4