Q: Solve:
Solve -13*a + 4 = -8*a - 11 for a.

A: 3

Q: Solve:
Solve 0 = 5*h - 3*h + 5*h for h.

A: 0

Q: Solve:
Solve 6972 = -655*g + 821*g for g.

A:
42