Solve 0 = -3421*b + 3412*b + 147 - 30 for b.
Solve this plz.

A: 13

Solve 25*w + 157 = 609 + 298 for w.
Solve this plz.

A: 30

Solve 25*b + 52 = 2 for b.
Solve this plz.

A:
-2