Q: Solve:
Solve -1209*z - 144 = -1227*z for z.

A: 8

Q: Solve:
Solve -44*r = 215*r - 31*r + 2508 for r.

A: -11

Q: Solve:
Solve 285*d + 57 + 103 = 275*d for d.

A:
-16