Solve 200*z = 2800 + 400 for z.
Solve this plz.

A: 16

Solve -285*k = 83*k + 2121 - 649 for k.
Solve this plz.

A: -4

Solve 2*y - 40 + 42 = 0 for y.
Solve this plz.

A:
-1