Solve 1531*v + 718*v - 65221 = 0 for v.
Solve this plz.

A: 29

Solve -21 = -10*f + 7*f for f.
Solve this plz.

A: 7

Solve 0 = 265*r + 3773 - 15963 for r.
Solve this plz.

A:
46