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d-9=10-8d+8
We move all terms to the left:
d-9-(10-8d+8)=0
We add all the numbers together, and all the variables
d-(-8d+18)-9=0
We get rid of parentheses
d+8d-18-9=0
We add all the numbers together, and all the variables
9d-27=0
We move all terms containing d to the left, all other terms to the right
9d=27
d=27/9
d=3
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