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7d=5+8d
We move all terms to the left:
7d-(5+8d)=0
We add all the numbers together, and all the variables
7d-(8d+5)=0
We get rid of parentheses
7d-8d-5=0
We add all the numbers together, and all the variables
-1d-5=0
We move all terms containing d to the left, all other terms to the right
-d=5
d=5/-1
d=-5
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