Solve -31*m - 31 + 161 = -87 for m.
Solve this plz.

A: 7

Solve -12*f + 461 = 9*f + 566 for f.
Solve this plz.

A: -5

Solve -2197360*x - 1060 = -2197413*x for x.
Solve this plz.

A:
20