Solve 53885 = 670*s - 1538*s - 546*s - 8331 for s.
Solve this plz.

A: -44

Solve -304303 - 1433960 = -25952*b - 6095*b + 56369 for b.
Solve this plz.

A: 56

Solve -138*u + 3719 = -124*u + 246*u - 4081 for u.
Solve this plz.

A:
30