Q: Solve:
Solve 69561*c - 69648*c = 1740 for c.

A: -20

Q: Solve:
Solve 0 = -10*o - 37*o - 36*o - 107*o - 7220 for o.

A: -38

Q: Solve:
Solve 48*s - 68*s - 20 = 0 for s.

A:
-1