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