Q: Solve:
Solve 112*r - 72*r - 360 = 0 for r.

A: 9

Q: Solve:
Solve 61*m + 10*m + 186*m = -7967 for m.

A: -31

Q: Solve:
Solve 0 = -2711*u - 189672 + 75810 for u.

A:
-42