Q: Solve:
Solve -9*x - 159 + 858 + 21 = 0 for x.

A: 80

Q: Solve:
Solve 0 = -13*o + 28 - 15 for o.

A: 1

Q: Solve:
Solve -219*v + 6310 = 532*v - 1200 for v.

A:
10