Q: What is the solution?
Solve 0*r - 12 = 12*r for r.

A: -1

Q: What is the solution?
Solve -588*t + 713*t = 1859*t + 52020 for t.

A: -30

Q: What is the solution?
Solve -31*u - 142 - 165 = -121 for u.

A:
-6