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