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8(d)=13(d-30)
We move all terms to the left:
8(d)-(13(d-30))=0
We calculate terms in parentheses: -(13(d-30)), so:We get rid of parentheses
13(d-30)
We multiply parentheses
13d-390
Back to the equation:
-(13d-390)
8d-13d+390=0
We add all the numbers together, and all the variables
-5d+390=0
We move all terms containing d to the left, all other terms to the right
-5d=-390
d=-390/-5
d=+78
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