Q: What is the solution?
Solve 0 = 15*v - 31 + 106 for v.

A: -5

Q: What is the solution?
Solve -1040*r = 383*r + 271*r - 329*r - 80535 for r.

A: 59

Q: What is the solution?
Solve 0 = -84*o - 3066 + 2898 for o.

A:
-2