Solve -124*m - 5 = -129*m for m.
Solve this plz.

A: 1

Solve -535281*b + 535244*b - 851 = 0 for b.
Solve this plz.

A: -23

Solve 0 = 24*u - 12 + 84 for u.
Solve this plz.

A:
-3