Solve 136 = 21396*z - 21388*z for z.
Solve this plz.

A: 17

Solve 0 = -2*s + 12 - 4 for s.
Solve this plz.

A: 4

Solve 158*z = -138*z + 203*z - 2511 for z.
Solve this plz.

A:
-27