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16=d/2+12
We move all terms to the left:
16-(d/2+12)=0
We get rid of parentheses
-d/2-12+16=0
We multiply all the terms by the denominator
-d-12*2+16*2=0
We add all the numbers together, and all the variables
-1d+8=0
We move all terms containing d to the left, all other terms to the right
-d=-8
d=-8/-1
d=+8
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