Solve -34*c + 16*c - 126 = 0 for c.
Solve this plz.

A: -7

Solve 57*k - 260 = -52*k - 42 for k.
Solve this plz.

A: 2

Solve 15*s - 18*s = -12 for s.
Solve this plz.

A:
4