Q: What is the solution?
Solve -77*l = -15*l - 124 for l.

A: 2

Q: What is the solution?
Solve -13 = 13*z - 0*z for z.

A: -1

Q: What is the solution?
Solve 24*k - 39*k + 105 = 0 for k.

A:
7