Q: Solve:
Solve 0 = -45*y + 110*y - 35*y + 750 for y.

A: -25

Q: Solve:
Solve -78 = -9*r - 6 for r.

A: 8

Q: Solve:
Solve -96*w - 66463 = 102*w + 1784*w - 16913 for w.

A:
-25