Solve 16566 = 448*c + 305*c for c.
Solve this plz.

A: 22

Solve 0 = 31*f + 665*f + 7247 + 6673 for f.
Solve this plz.

A: -20

Solve -205*s - 48 = -211*s for s.
Solve this plz.

A:
8