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-10d-2=-9d
We move all terms to the left:
-10d-2-(-9d)=0
We get rid of parentheses
-10d+9d-2=0
We add all the numbers together, and all the variables
-1d-2=0
We move all terms containing d to the left, all other terms to the right
-d=2
d=2/-1
d=-2
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