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112=4(7+d)
We move all terms to the left:
112-(4(7+d))=0
We add all the numbers together, and all the variables
-(4(d+7))+112=0
We calculate terms in parentheses: -(4(d+7)), so:We get rid of parentheses
4(d+7)
We multiply parentheses
4d+28
Back to the equation:
-(4d+28)
-4d-28+112=0
We add all the numbers together, and all the variables
-4d+84=0
We move all terms containing d to the left, all other terms to the right
-4d=-84
d=-84/-4
d=+21
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