Solve -b + 29 = 27 for b.
Solve this plz.

A: 2

Solve 84231 - 3900 = -1250*s + 9081 for s.
Solve this plz.

A: -57

Solve -494 = -42*x + 226 - 216 for x.
Solve this plz.

A:
12