Q: Solve:
Solve -26*u + 377*u - 1086 + 507 = -5142 for u.

A: -13

Q: Solve:
Solve -137 = 49*q + 136 + 168 for q.

A: -9

Q: Solve:
Solve -18 = -19*o + o for o.

A:
1