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(7z+7)+(9z-7)=90
We move all terms to the left:
(7z+7)+(9z-7)-(90)=0
We get rid of parentheses
7z+9z+7-7-90=0
We add all the numbers together, and all the variables
16z-90=0
We move all terms containing z to the left, all other terms to the right
16z=90
z=90/16
z=5+5/8
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