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15d+6=6+15d
We move all terms to the left:
15d+6-(6+15d)=0
We add all the numbers together, and all the variables
15d-(15d+6)+6=0
We get rid of parentheses
15d-15d-6+6=0
We add all the numbers together, and all the variables
=0
d=0/1
d=0
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