Q: What is the solution?
Solve -21*i + 33*i = -13*i - 125 for i.

A: -5

Q: What is the solution?
Solve -z + 16 = 14 for z.

A: 2

Q: What is the solution?
Solve -297*c - 54*c = 6669 for c.

A:
-19