Solve -171*s + 379 = 247 - 1578 for s.
Solve this plz.

A: 10

Solve -5118*w = -5111*w + 196 for w.
Solve this plz.

A: -28

Solve 141*f - 35 + 52 = 581 for f.
Solve this plz.

A:
4