Solve 646 - 454 = -17*w - 79*w for w.
Solve this plz.

A: -2

Solve -27631 + 27856 = 15*y for y.
Solve this plz.

A: 15

Solve 0 = 143*s - 1310 - 892 - 979 - 1109 for s.
Solve this plz.

A:
30