Solve 0 = -3*f - f - 16 for f.
Solve this plz.

A: -4

Solve 446*c + 14196 = -23*c - 349*c + 142*c for c.
Solve this plz.

A: -21

Solve 13*r - 6*r = -11*r - 36 for r.
Solve this plz.

A:
-2