Q: What is the solution?
Solve 60 = 20*u + 280 for u.

A: -11

Q: What is the solution?
Solve 872*r - 17530 = 185*r + 31934 for r.

A: 72

Q: What is the solution?
Solve 7 = -16*w - 41 for w.

A:
-3