Q: Solve:
Solve 390*o + 137 - 282 = -74 + 319 for o.

A: 1

Q: Solve:
Solve 407*r + 3325 - 883 = 0 for r.

A: -6

Q: Solve:
Solve -319*q + 35*q - 1648 = 63*q + 15702 for q.

A:
-50