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-8d-9=-6d+9
We move all terms to the left:
-8d-9-(-6d+9)=0
We get rid of parentheses
-8d+6d-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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