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31.2d=77.7
We move all terms to the left:
31.2d-(77.7)=0
We add all the numbers together, and all the variables
31.2d-77.7=0
We move all terms containing d to the left, all other terms to the right
31.2d=77.7
d=77.7/31.2
d=2+11.769230769231/24
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