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9d+8=4d+28
We move all terms to the left:
9d+8-(4d+28)=0
We get rid of parentheses
9d-4d-28+8=0
We add all the numbers together, and all the variables
5d-20=0
We move all terms containing d to the left, all other terms to the right
5d=20
d=20/5
d=4
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