Q: What is the solution?
Solve -11*a + 21*a = 60*a + 1650 for a.

A: -33

Q: What is the solution?
Solve 5470*o - 1528*o + 11750 + 123427 = -132879 for o.

A: -68

Q: What is the solution?
Solve -391*r - 24056 - 4878 = 0 for r.

A:
-74