Solve -99 = -20*z - 13*z for z.
Solve this plz.

A: 3

Solve 28*f + 39*f = -38*f for f.
Solve this plz.

A: 0

Solve -20*u = 17*u + 21*u + 464 for u.
Solve this plz.

A:
-8