Q: What is the solution?
Solve 139*u = 122*u - 312 + 57 for u.

A: -15

Q: What is the solution?
Solve 29*z - 53*z = 81*z + 945 for z.

A: -9

Q: What is the solution?
Solve -57*m = -557 - 184 for m.

A:
13