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4(2z-8)=15
We move all terms to the left:
4(2z-8)-(15)=0
We multiply parentheses
8z-32-15=0
We add all the numbers together, and all the variables
8z-47=0
We move all terms containing z to the left, all other terms to the right
8z=47
z=47/8
z=5+7/8
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