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(d+6)=3(d-4)
We move all terms to the left:
(d+6)-(3(d-4))=0
We get rid of parentheses
d-(3(d-4))+6=0
We calculate terms in parentheses: -(3(d-4)), so:We get rid of parentheses
3(d-4)
We multiply parentheses
3d-12
Back to the equation:
-(3d-12)
d-3d+12+6=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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