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81=9(d-83)
We move all terms to the left:
81-(9(d-83))=0
We calculate terms in parentheses: -(9(d-83)), so:We get rid of parentheses
9(d-83)
We multiply parentheses
9d-747
Back to the equation:
-(9d-747)
-9d+747+81=0
We add all the numbers together, and all the variables
-9d+828=0
We move all terms containing d to the left, all other terms to the right
-9d=-828
d=-828/-9
d=+92
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