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90=9(d+2)
We move all terms to the left:
90-(9(d+2))=0
We calculate terms in parentheses: -(9(d+2)), so:We get rid of parentheses
9(d+2)
We multiply parentheses
9d+18
Back to the equation:
-(9d+18)
-9d-18+90=0
We add all the numbers together, and all the variables
-9d+72=0
We move all terms containing d to the left, all other terms to the right
-9d=-72
d=-72/-9
d=+8
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