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d/3-3=4
We move all terms to the left:
d/3-3-(4)=0
We add all the numbers together, and all the variables
d/3-7=0
We multiply all the terms by the denominator
d-7*3=0
We add all the numbers together, and all the variables
d-21=0
We move all terms containing d to the left, all other terms to the right
d=21
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