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-d=d-8
We move all terms to the left:
-d-(d-8)=0
We add all the numbers together, and all the variables
-1d-(d-8)=0
We get rid of parentheses
-1d-d+8=0
We add all the numbers together, and all the variables
-2d+8=0
We move all terms containing d to the left, all other terms to the right
-2d=-8
d=-8/-2
d=+4
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