Q: What is the solution?
Solve -9*l + 42 - 60 = 0 for l.

A: -2

Q: What is the solution?
Solve 21*z - 61*z - 560 = 0 for z.

A: -14

Q: What is the solution?
Solve 132*o - 816*o = 788*o - 57622 - 15978 for o.

A:
50