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20d=5d+30
We move all terms to the left:
20d-(5d+30)=0
We get rid of parentheses
20d-5d-30=0
We add all the numbers together, and all the variables
15d-30=0
We move all terms containing d to the left, all other terms to the right
15d=30
d=30/15
d=2
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