Solve -350 + 70 = -280*v for v.
Solve this plz.

A: 1

Solve 152*k + 378 = -155*k + 334*k for k.
Solve this plz.

A: 14

Solve -308*f - 397*f - 5610 = -97*f + 31478 for f.
Solve this plz.

A:
-61