Solve 15*x - 77*x + 539 = 15*x for x.
Solve this plz.

A: 7

Solve -98*g + 89 - 332 = -145 for g.
Solve this plz.

A: -1

Solve -2*f - 214 = -15*f - 97 for f.
Solve this plz.

A:
9