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87=d-(-53)
We move all terms to the left:
87-(d-(-53))=0
We calculate terms in parentheses: -(d-(-53)), so:We get rid of parentheses
d-(-53)
We add all the numbers together, and all the variables
d+53
Back to the equation:
-(d+53)
-d-53+87=0
We add all the numbers together, and all the variables
-1d+34=0
We move all terms containing d to the left, all other terms to the right
-d=-34
d=-34/-1
d=+34
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