Q: Solve:
Solve -23*a + 7*a + 64 = 0 for a.

A: 4

Q: Solve:
Solve -9*p = -21*p - 39*p + 1071 for p.

A: 21

Q: Solve:
Solve -31 = -8*c - 55 for c.

A:
-3