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457=617-d
We move all terms to the left:
457-(617-d)=0
We add all the numbers together, and all the variables
-(-1d+617)+457=0
We get rid of parentheses
1d-617+457=0
We add all the numbers together, and all the variables
d-160=0
We move all terms containing d to the left, all other terms to the right
d=160
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