Solve 0 = -105*b - 3057 + 668 - 2441 for b.
Solve this plz.

A: -46

Solve 116*s + 56 = 144*s for s.
Solve this plz.

A: 2

Solve -21 + 23 = -2*k for k.
Solve this plz.

A:
-1