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43d-3d=d+9
We move all terms to the left:
43d-3d-(d+9)=0
We add all the numbers together, and all the variables
40d-(d+9)=0
We get rid of parentheses
40d-d-9=0
We add all the numbers together, and all the variables
39d-9=0
We move all terms containing d to the left, all other terms to the right
39d=9
d=9/39
d=3/13
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