Q: What is the solution?
Solve -2*k = 2*k - 12 for k.

A: 3

Q: What is the solution?
Solve -51*w = 66*w + 1170 for w.

A: -10

Q: What is the solution?
Solve -178*l + 185*l + 7 = 0 for l.

A:
-1