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8=4(2z+1)
We move all terms to the left:
8-(4(2z+1))=0
We calculate terms in parentheses: -(4(2z+1)), so:We get rid of parentheses
4(2z+1)
We multiply parentheses
8z+4
Back to the equation:
-(8z+4)
-8z-4+8=0
We add all the numbers together, and all the variables
-8z+4=0
We move all terms containing z to the left, all other terms to the right
-8z=-4
z=-4/-8
z=1/2
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