Q: What is the solution?
Solve -9*u - 12 = -5*u for u.

A: -3

Q: What is the solution?
Solve 0 = -b - 7 + 11 for b.

A: 4

Q: What is the solution?
Solve 8*f - 7*f - 5 = 0 for f.

A:
5