Q: What is the solution?
Solve -31*c - 90 = -16*c for c.

A: -6

Q: What is the solution?
Solve 7*c + 2*c = 54*c - 630 for c.

A: 14

Q: What is the solution?
Solve -694765 + 696364 = -41*h for h.

A:
-39