Solve 0 = 3*c + 2*c - 15 for c.
Solve this plz.

A: 3

Solve 56*x - 135 - 473 = 960 for x.
Solve this plz.

A: 28

Solve -255*k + 5652 = 216*k for k.
Solve this plz.

A:
12