Solve -224 = 492*f + 480*f - 956*f for f.
Solve this plz.

A: -14

Solve -13*h - 16*h + 1764 = -78*h for h.
Solve this plz.

A: -36

Solve -78 - 21 = -15*r + 6*r for r.
Solve this plz.

A:
11