Solve -42*x + 59*x + 102 = 0 for x.
Solve this plz.

A: -6

Solve -10*o + 5*o + 46 - 86 = 0 for o.
Solve this plz.

A: -8

Solve 10*i = 687 - 617 for i.
Solve this plz.

A:
7