Solve 32*n + 423*n = -780*n - 19760 for n.
Solve this plz.

A: -16

Solve -33660*z = -33764*z - 4056 for z.
Solve this plz.

A: -39

Solve -43 = 15*i + 17 for i.
Solve this plz.

A:
-4