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637=d/22+623
We move all terms to the left:
637-(d/22+623)=0
We get rid of parentheses
-d/22-623+637=0
We multiply all the terms by the denominator
-d-623*22+637*22=0
We add all the numbers together, and all the variables
-1d+308=0
We move all terms containing d to the left, all other terms to the right
-d=-308
d=-308/-1
d=+308
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