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80=8(d-89)
We move all terms to the left:
80-(8(d-89))=0
We calculate terms in parentheses: -(8(d-89)), so:We get rid of parentheses
8(d-89)
We multiply parentheses
8d-712
Back to the equation:
-(8d-712)
-8d+712+80=0
We add all the numbers together, and all the variables
-8d+792=0
We move all terms containing d to the left, all other terms to the right
-8d=-792
d=-792/-8
d=+99
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