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-d=7+6d
We move all terms to the left:
-d-(7+6d)=0
We add all the numbers together, and all the variables
-d-(6d+7)=0
We add all the numbers together, and all the variables
-1d-(6d+7)=0
We get rid of parentheses
-1d-6d-7=0
We add all the numbers together, and all the variables
-7d-7=0
We move all terms containing d to the left, all other terms to the right
-7d=7
d=7/-7
d=-1
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