Solve -321 = -5*f - 356 for f.
Solve this plz.

A: -7

Solve 63*t = 67*t + 716 - 836 for t.
Solve this plz.

A: 30

Solve 0 = 3*o + 4 + 11 for o.
Solve this plz.

A:
-5