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4=2(d-7)
We move all terms to the left:
4-(2(d-7))=0
We calculate terms in parentheses: -(2(d-7)), so:We get rid of parentheses
2(d-7)
We multiply parentheses
2d-14
Back to the equation:
-(2d-14)
-2d+14+4=0
We add all the numbers together, and all the variables
-2d+18=0
We move all terms containing d to the left, all other terms to the right
-2d=-18
d=-18/-2
d=+9
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