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62d+20=20d+400
We move all terms to the left:
62d+20-(20d+400)=0
We get rid of parentheses
62d-20d-400+20=0
We add all the numbers together, and all the variables
42d-380=0
We move all terms containing d to the left, all other terms to the right
42d=380
d=380/42
d=9+1/21
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