Q: What is the solution?
Solve 0 = -28*o - 33 + 229 for o.

A: 7

Q: What is the solution?
Solve -346*c - 6149 = 400*c - 242*c + 23083 for c.

A: -58

Q: What is the solution?
Solve 390 = -119*r - 549*r - 278 for r.

A:
-1