Q: Solve:
Solve -8380 = -1403*o + 4247 for o.

A: 9

Q: Solve:
Solve -5*h - 2 - 18 = 0 for h.

A: -4

Q: Solve:
Solve -761*r = -143*r + 222*r - 109200 for r.

A:
130