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-10d=-9d-8
We move all terms to the left:
-10d-(-9d-8)=0
We get rid of parentheses
-10d+9d+8=0
We add all the numbers together, and all the variables
-1d+8=0
We move all terms containing d to the left, all other terms to the right
-d=-8
d=-8/-1
d=+8
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