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80=8(z+3)
We move all terms to the left:
80-(8(z+3))=0
We calculate terms in parentheses: -(8(z+3)), so:We get rid of parentheses
8(z+3)
We multiply parentheses
8z+24
Back to the equation:
-(8z+24)
-8z-24+80=0
We add all the numbers together, and all the variables
-8z+56=0
We move all terms containing z to the left, all other terms to the right
-8z=-56
z=-56/-8
z=+7
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