Solve 170*u + 4393 - 2170 + 1420 + 3157 = 0 for u.
Solve this plz.

A: -40

Solve -18*x - 80 = -0*x + 46 for x.
Solve this plz.

A: -7

Solve 60*m + 4 = 56*m for m.
Solve this plz.

A:
-1