Answer:
The answer is 4az + a + 4z − 4
Step-by-step explanation:
= a + 9az + - 4 + -5az + 4z
= a + 9az + -4 + -5az +4z
= (9az + -5az) + (a) + (4z) + (-4)
= 4az + a + 4z - 4
