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d/2-3=6
We move all terms to the left:
d/2-3-(6)=0
We add all the numbers together, and all the variables
d/2-9=0
We multiply all the terms by the denominator
d-9*2=0
We add all the numbers together, and all the variables
d-18=0
We move all terms containing d to the left, all other terms to the right
d=18
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