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-d-6=-2d
We move all terms to the left:
-d-6-(-2d)=0
We add all the numbers together, and all the variables
-1d-(-2d)-6=0
We get rid of parentheses
-1d+2d-6=0
We add all the numbers together, and all the variables
d-6=0
We move all terms containing d to the left, all other terms to the right
d=6
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