Q: Solve s = -42 + 39 for s.

A: -3

Q: Solve -65*c - 16*c - 163*c = -393*c - 20115 for c.

A: -135

Q: Solve -1008 + 1971 = 151*q - 1755 for q.

A: 18

Q: Solve 309*q + 316*q + 6 = 637*q - 966 for q.

A:
81