Q: Solve:
Solve -12051 - 12837 = -2178*h - 101118 for h.

A: -35

Q: Solve:
Solve 0 = 18*r + 13*r + 8*r - 11*r for r.

A: 0

Q: Solve:
Solve -8*r - 20 = 20 for r.

A:
-5