Solve 336*o - 2172 + 4677 = 10398 + 8907 for o.
Solve this plz.

A: 50

Solve 0 = -681*v + 455*v - 3842 for v.
Solve this plz.

A: -17

Solve -25*n + 3390 = 78*n + 10*n for n.
Solve this plz.

A:
30