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71=15+7d
We move all terms to the left:
71-(15+7d)=0
We add all the numbers together, and all the variables
-(7d+15)+71=0
We get rid of parentheses
-7d-15+71=0
We add all the numbers together, and all the variables
-7d+56=0
We move all terms containing d to the left, all other terms to the right
-7d=-56
d=-56/-7
d=+8
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