Q: Solve:
Solve -19*z = 31*z - 150 for z.

A: 3

Q: Solve:
Solve -70*o + 10812 = 268*o - 126*o for o.

A: 51

Q: Solve:
Solve 217*u + 3948*u - 103019 = 26669 - 21398 for u.

A:
26