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d=8+2d
We move all terms to the left:
d-(8+2d)=0
We add all the numbers together, and all the variables
d-(2d+8)=0
We get rid of parentheses
d-2d-8=0
We add all the numbers together, and all the variables
-1d-8=0
We move all terms containing d to the left, all other terms to the right
-d=8
d=8/-1
d=-8
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