Solve 2*i = -12 + 4 for i.
Solve this plz.

A: -4

Solve 0 = -7*k + 8*k - 3 for k.
Solve this plz.

A: 3

Solve -680 = 17*n - 22*n - 29*n for n.
Solve this plz.

A:
20