Q: What is the solution?
Solve -9 = -2*g - 13 for g.

A: -2

Q: What is the solution?
Solve 240*o + 142*o = -5730 for o.

A: -15

Q: What is the solution?
Solve -45*v - 126 + 70 - 214 = 0 for v.

A:
-6