Solve -80*k + 486 + 2492 = 738 for k.
Solve this plz.

A: 28

Solve 7*f + 1331647 - 1331007 = -9*f for f.
Solve this plz.

A: -40

Solve 60 = -25*y + 40*y for y.
Solve this plz.

A:
4