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11d+9d-2=5d+20
We move all terms to the left:
11d+9d-2-(5d+20)=0
We add all the numbers together, and all the variables
20d-(5d+20)-2=0
We get rid of parentheses
20d-5d-20-2=0
We add all the numbers together, and all the variables
15d-22=0
We move all terms containing d to the left, all other terms to the right
15d=22
d=22/15
d=1+7/15
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