Solve 12*m = -6*m - 18 for m.
Solve this plz.

A: -1

Solve -5*u = -13 - 7 for u.
Solve this plz.

A: 4

Solve 489*d = 1844*d + 2412*d + 73771 + 12870 for d.
Solve this plz.

A:
-23