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13.500=5200d
We move all terms to the left:
13.500-(5200d)=0
We add all the numbers together, and all the variables
-5200d+13.5=0
We move all terms containing d to the left, all other terms to the right
-5200d=-13.5
d=-13.5/-5200
d=1/385.18518518519
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