Solve 454*f + 663184 + 86505 = 4283*f + 6730*f for f.
Solve this plz.

A: 71

Solve -15*i = -29*i + 27*i + 130 for i.
Solve this plz.

A: -10

Solve 1218*f = 1240*f - 132 for f.
Solve this plz.

A:
6