Solve 0 = 307*u - 322*u - 30 for u.
Solve this plz.

A: -2

Solve 7711004*b = 7711128*b - 13888 for b.
Solve this plz.

A: 112

Solve 2029*s - 2023*s = 18 for s.
Solve this plz.

A:
3