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d/21-520=-489
We move all terms to the left:
d/21-520-(-489)=0
We add all the numbers together, and all the variables
d/21-31=0
We multiply all the terms by the denominator
d-31*21=0
We add all the numbers together, and all the variables
d-651=0
We move all terms containing d to the left, all other terms to the right
d=651
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