Solve 20*r + 32*r = -515 + 99 for r.
Solve this plz.

A: -8

Solve -15570 = -15882*w + 16228*w for w.
Solve this plz.

A: -45

Solve -25*f - 20 = -15*f for f.
Solve this plz.

A:
-2