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9-8d=-10d-9
We move all terms to the left:
9-8d-(-10d-9)=0
We get rid of parentheses
-8d+10d+9+9=0
We add all the numbers together, and all the variables
2d+18=0
We move all terms containing d to the left, all other terms to the right
2d=-18
d=-18/2
d=-9
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