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d/18+6=12
We move all terms to the left:
d/18+6-(12)=0
We add all the numbers together, and all the variables
d/18-6=0
We multiply all the terms by the denominator
d-6*18=0
We add all the numbers together, and all the variables
d-108=0
We move all terms containing d to the left, all other terms to the right
d=108
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