Q: Solve 4631 = -640*r - 189*r + 32817 for r.

A: 34

Q: Solve -11*f = -9*f - 14 for f.

A: 7

Q: Solve 20*q + 147315 = -907*q + 38*q - 392*q for q.

A: -115

Q: Solve 0 = -10800*z + 10645*z - 7130 for z.

A:
-46