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7.5d=13.5
We move all terms to the left:
7.5d-(13.5)=0
We add all the numbers together, and all the variables
7.5d-13.5=0
We move all terms containing d to the left, all other terms to the right
7.5d=13.5
d=13.5/7.5
d=1+6/7.5
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