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-2z-7+11z=9z-7
We move all terms to the left:
-2z-7+11z-(9z-7)=0
We add all the numbers together, and all the variables
9z-(9z-7)-7=0
We get rid of parentheses
9z-9z+7-7=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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