Solve 0 = -41*z + 42*z - 5 for z.
Solve this plz.

A: 5

Solve 0 = 33*s + 29*s + 663 - 1779 for s.
Solve this plz.

A: 18

Solve 420 - 195 + 251 = -28*w for w.
Solve this plz.

A:
-17