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(5z-13)=102
We move all terms to the left:
(5z-13)-(102)=0
We get rid of parentheses
5z-13-102=0
We add all the numbers together, and all the variables
5z-115=0
We move all terms containing z to the left, all other terms to the right
5z=115
z=115/5
z=23
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