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8d-9=-9d
We move all terms to the left:
8d-9-(-9d)=0
We get rid of parentheses
8d+9d-9=0
We add all the numbers together, and all the variables
17d-9=0
We move all terms containing d to the left, all other terms to the right
17d=9
d=9/17
d=9/17
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