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-28=-7(d-85)
We move all terms to the left:
-28-(-7(d-85))=0
We calculate terms in parentheses: -(-7(d-85)), so:We get rid of parentheses
-7(d-85)
We multiply parentheses
-7d+595
Back to the equation:
-(-7d+595)
7d-595-28=0
We add all the numbers together, and all the variables
7d-623=0
We move all terms containing d to the left, all other terms to the right
7d=623
d=623/7
d=89
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