Solve l - 19*l - 7*l + 162 = -313 for l.
Solve this plz.

A: 19

Solve 7*o + 53*o = 0 for o.
Solve this plz.

A: 0

Solve -r + 60 - 42 = 39 for r.
Solve this plz.

A:
-21