Solve -7*u - 418 = 2*u - 31*u for u.
Solve this plz.

A: 19

Solve -68824*w + 69016*w = 0 for w.
Solve this plz.

A: 0

Solve 0 = 855*c - 2639 - 5056 for c.
Solve this plz.

A:
9