Solve 0 = 8*n - 15*n + 16*n - 54 for n.
Solve this plz.

A: 6

Solve 9 + 21 = 6*t for t.
Solve this plz.

A: 5

Solve -21 = 15*o - 8*o for o.
Solve this plz.

A:
-3