Q: Solve:
Solve -2357*r + 4742*r - 194473 - 117962 = 0 for r.

A: 131

Q: Solve:
Solve 219*o - 360 = -141*o for o.

A: 1

Q: Solve:
Solve -4*o - 12 + 28 = 0 for o.

A:
4