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71=7d+7
We move all terms to the left:
71-(7d+7)=0
We get rid of parentheses
-7d-7+71=0
We add all the numbers together, and all the variables
-7d+64=0
We move all terms containing d to the left, all other terms to the right
-7d=-64
d=-64/-7
d=9+1/7
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