Q: What is the solution?
Solve -123*k + 125*k + 4 = 0 for k.

A: -2

Q: What is the solution?
Solve -11934 = -524*s + 78*s + 11348 + 17304 for s.

A: 91

Q: What is the solution?
Solve 11*f = 13*f + 2 for f.

A:
-1