Q: Solve:
Solve 7 = -4*o - 21 for o.

A: -7

Q: Solve:
Solve 0 = -7*d + 81 - 46 for d.

A: 5

Q: Solve:
Solve 5440*w - 8474 - 39104 + 115132 = -106526 for w.

A:
-32