Verified Answer :

Combine like terms to simplify.

3z + 5z = 8z

4 - 9 = -5

8z - 5

Answer:   8z - 5

You would simply combine like terms
3z+4+5z-9
3z+5z=8z
4-9=-5
Put them together to get a final answer of: 8z-5 OR -5+8x also works :)  

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