Q: What is the solution?
Solve 30*f - 9810 = -10650 for f.

A: -28

Q: What is the solution?
Solve 142*i - 1210 = 226*i - 139*i for i.

A: 22

Q: What is the solution?
Solve 69657 + 77190 = -1579*o for o.

A:
-93