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-9-10d=-9-7d
We move all terms to the left:
-9-10d-(-9-7d)=0
We add all the numbers together, and all the variables
-10d-(-7d-9)-9=0
We get rid of parentheses
-10d+7d+9-9=0
We add all the numbers together, and all the variables
-3d=0
d=0/-3
d=0
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