Solve -10*c + 16*c - 12 = 0 for c.
Solve this plz.

A: 2

Solve 310*c - 13510 = 294*c + 3301*c + 42335 for c.
Solve this plz.

A: -17

Solve 2551*z - 8744 = 21868 for z.
Solve this plz.

A:
12