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11d-10-2d=9d-10
We move all terms to the left:
11d-10-2d-(9d-10)=0
We add all the numbers together, and all the variables
9d-(9d-10)-10=0
We get rid of parentheses
9d-9d+10-10=0
We add all the numbers together, and all the variables
=0
d=0/1
d=0
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