Q: Solve -1653 + 1617 = 9*c for c.

A: -4

Q: Solve -30913 = 68*r - 36013 for r.

A: 75

Q: Solve 70*c - 4*c + 133 = -131 for c.

A: -4

Q: Solve 0 = 4300*z - 4314*z - 812 for z.

A:
-58