Solve -12*c = 21*c + 13*c + 138 for c.
Solve this plz.

A: -3

Solve 583*l - 29874 = -2521 + 1797 for l.
Solve this plz.

A: 50

Solve 67*f + 505 = -44*f - 161 for f.
Solve this plz.

A:
-6