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7d=4+8d
We move all terms to the left:
7d-(4+8d)=0
We add all the numbers together, and all the variables
7d-(8d+4)=0
We get rid of parentheses
7d-8d-4=0
We add all the numbers together, and all the variables
-1d-4=0
We move all terms containing d to the left, all other terms to the right
-d=4
d=4/-1
d=-4
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