Solve 3937 = 115*n + 1752 for n.
Solve this plz.

A: 19

Solve 20*y + 48*y = 98*y - 120 for y.
Solve this plz.

A: 4

Solve 17*o + 389 - 839 = 42*o for o.
Solve this plz.

A:
-18