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90=6(d-84)
We move all terms to the left:
90-(6(d-84))=0
We calculate terms in parentheses: -(6(d-84)), so:We get rid of parentheses
6(d-84)
We multiply parentheses
6d-504
Back to the equation:
-(6d-504)
-6d+504+90=0
We add all the numbers together, and all the variables
-6d+594=0
We move all terms containing d to the left, all other terms to the right
-6d=-594
d=-594/-6
d=+99
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