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28=d/3+20
We move all terms to the left:
28-(d/3+20)=0
We get rid of parentheses
-d/3-20+28=0
We multiply all the terms by the denominator
-d-20*3+28*3=0
We add all the numbers together, and all the variables
-1d+24=0
We move all terms containing d to the left, all other terms to the right
-d=-24
d=-24/-1
d=+24
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