Solve 0 = 5*o + 40 - 25 for o.
Solve this plz.

A: -3

Solve -134*d + 1092 = 142*d - 3048 for d.
Solve this plz.

A: 15

Solve 1662 = -5*f + 1647 for f.
Solve this plz.

A:
-3