Q: What is the solution?
Solve 0 = 2*o - 6*o - 4 for o.

A: -1

Q: What is the solution?
Solve 0 = -7*c + 10921 - 10767 for c.

A: 22

Q: What is the solution?
Solve -145*d + 12239 = 22679 for d.

A:
-72