Q: Solve 5*c + 10*c - 45 = 0 for c.

A: 3

Q: Solve 6*s - 30 + 78 = 0 for s.

A: -8

Q: Solve -270*o = -303*o - 231 for o.

A: -7

Q: Solve 0 = -100*v - 40*v - 1142 - 258 for v.

A:
-10