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20=4(d+2)
We move all terms to the left:
20-(4(d+2))=0
We calculate terms in parentheses: -(4(d+2)), so:We get rid of parentheses
4(d+2)
We multiply parentheses
4d+8
Back to the equation:
-(4d+8)
-4d-8+20=0
We add all the numbers together, and all the variables
-4d+12=0
We move all terms containing d to the left, all other terms to the right
-4d=-12
d=-12/-4
d=+3
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