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13=d/3+12
We move all terms to the left:
13-(d/3+12)=0
We get rid of parentheses
-d/3-12+13=0
We multiply all the terms by the denominator
-d-12*3+13*3=0
We add all the numbers together, and all the variables
-1d+3=0
We move all terms containing d to the left, all other terms to the right
-d=-3
d=-3/-1
d=+3
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