Solve -21*l - 6*l + 18*l + 162 = 0 for l.
Solve this plz.

A: 18

Solve -12*f + 5 - 36 = 29 for f.
Solve this plz.

A: -5

Solve 19*u + 75*u = 27*u - 282 - 522 for u.
Solve this plz.

A:
-12