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2(7z-7)=13
We move all terms to the left:
2(7z-7)-(13)=0
We multiply parentheses
14z-14-13=0
We add all the numbers together, and all the variables
14z-27=0
We move all terms containing z to the left, all other terms to the right
14z=27
z=27/14
z=1+13/14
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