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90=6(z+7)
We move all terms to the left:
90-(6(z+7))=0
We calculate terms in parentheses: -(6(z+7)), so:We get rid of parentheses
6(z+7)
We multiply parentheses
6z+42
Back to the equation:
-(6z+42)
-6z-42+90=0
We add all the numbers together, and all the variables
-6z+48=0
We move all terms containing z to the left, all other terms to the right
-6z=-48
z=-48/-6
z=+8
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