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64-8z=4(z-5)
We move all terms to the left:
64-8z-(4(z-5))=0
We calculate terms in parentheses: -(4(z-5)), so:We get rid of parentheses
4(z-5)
We multiply parentheses
4z-20
Back to the equation:
-(4z-20)
-8z-4z+20+64=0
We add all the numbers together, and all the variables
-12z+84=0
We move all terms containing z to the left, all other terms to the right
-12z=-84
z=-84/-12
z=+7
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