Q: What is the solution?
Solve 31*h - h - 300 = 0 for h.

A: 10

Q: What is the solution?
Solve 17289 = -4*a + 17457 for a.

A: 42

Q: What is the solution?
Solve 25*c - 8 + 158 = -75 for c.

A:
-9