Solve 5*k + 15 + 0 = 0 for k.
Solve this plz.

A: -3

Solve -9273*b = -9002*b - 542 for b.
Solve this plz.

A: 2

Solve 5017*c + 835740 - 308955 = 0 for c.
Solve this plz.

A:
-105