Q: What is the solution?
Solve -57 = 6*q + 3 for q.

A: -10

Q: What is the solution?
Solve 15*k + 1590 = 1290 for k.

A: -20

Q: What is the solution?
Solve -28*s - 107*s - 2166 = -6 for s.

A:
-16