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90=6(d+13)
We move all terms to the left:
90-(6(d+13))=0
We calculate terms in parentheses: -(6(d+13)), so:We get rid of parentheses
6(d+13)
We multiply parentheses
6d+78
Back to the equation:
-(6d+78)
-6d-78+90=0
We add all the numbers together, and all the variables
-6d+12=0
We move all terms containing d to the left, all other terms to the right
-6d=-12
d=-12/-6
d=+2
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