Solve -454 = 135*b + 491 for b.
Solve this plz.

A: -7

Solve -972*p + 308*p - 5976 = 0 for p.
Solve this plz.

A: -9

Solve 24*i + 140 - 400 = -20 for i.
Solve this plz.

A:
10