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8z+28=4(z+1)
We move all terms to the left:
8z+28-(4(z+1))=0
We calculate terms in parentheses: -(4(z+1)), so:We get rid of parentheses
4(z+1)
We multiply parentheses
4z+4
Back to the equation:
-(4z+4)
8z-4z-4+28=0
We add all the numbers together, and all the variables
4z+24=0
We move all terms containing z to the left, all other terms to the right
4z=-24
z=-24/4
z=-6
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