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12.3d=13.9
We move all terms to the left:
12.3d-(13.9)=0
We add all the numbers together, and all the variables
12.3d-13.9=0
We move all terms containing d to the left, all other terms to the right
12.3d=13.9
d=13.9/12.3
d=1+1/7.6875
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