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8z-15=4z+13
We move all terms to the left:
8z-15-(4z+13)=0
We get rid of parentheses
8z-4z-13-15=0
We add all the numbers together, and all the variables
4z-28=0
We move all terms containing z to the left, all other terms to the right
4z=28
z=28/4
z=7
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