$z< -2$ OR $z \geq 3$
Combine the results: \(\boxed{(-\infty, -2) \cup [3, \infty)}\)
Step 1 :Solve the inequality separately: $z < -2$ and $z geq 3$
Step 2 :Combine the results: \(\boxed{(-\infty, -2) \cup [3, \infty)}\)