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20=d+9d
We move all terms to the left:
20-(d+9d)=0
We add all the numbers together, and all the variables
-(+10d)+20=0
We get rid of parentheses
-10d+20=0
We move all terms containing d to the left, all other terms to the right
-10d=-20
d=-20/-10
d=+2
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