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7.5d=3.72
We move all terms to the left:
7.5d-(3.72)=0
We add all the numbers together, and all the variables
7.5d-3.72=0
We move all terms containing d to the left, all other terms to the right
7.5d=3.72
d=3.72/7.5
d=2.16279069767/4.36046511628
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