Solve -27*x + 39*x + 36 = 0 for x.
Solve this plz.

A: -3

Solve 19*x + 50*x - 9745 = -8227 for x.
Solve this plz.

A: 22

Solve -3*r + 9 - 21 = 0 for r.
Solve this plz.

A:
-4