Solve 40*f - 25*f + 30 = 0 for f.
Solve this plz.

A: -2

Solve 95*k - 581 = 84 for k.
Solve this plz.

A: 7

Solve 29*w - 24 + 39 = -14 for w.
Solve this plz.

A:
-1