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