Solve 13*x + 45 - 8 + 28 = 0 for x.
Solve this plz.

A: -5

Solve 3031*u + 240 = -3031*u + 6074*u for u.
Solve this plz.

A: 20

Solve -3115*c - 947 - 72566 = -1868 for c.
Solve this plz.

A:
-23