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d+8d+4=4+9d
We move all terms to the left:
d+8d+4-(4+9d)=0
We add all the numbers together, and all the variables
d+8d-(9d+4)+4=0
We add all the numbers together, and all the variables
9d-(9d+4)+4=0
We get rid of parentheses
9d-9d-4+4=0
We add all the numbers together, and all the variables
=0
d=0/1
d=0
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