Q: Solve:
Solve -255 - 264 = -24*r + 57 for r.

A: 24

Q: Solve:
Solve -22*a - 43*a - 2289 = -7*a + 321 for a.

A: -45

Q: Solve:
Solve 6 = 8*c - 5*c for c.

A:
2