Hi! Thank you for the opportunity to help you with your question!
To simplify this, you want to group all the similar things together. That means you want to group all the "z"s and all the integers.
After grouping the similar things together, you have (9z - 2z) + (-7 +2).
You further simplify that to get 7z + (-5), which is the same thing as 7z - 5.
Quick note for future questions: remember that order doesn't matter! If you rearrange it like (-7 +2) + (9z-2z), you still get the same answer!
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