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2.5d-5+9.5d=16.5
We move all terms to the left:
2.5d-5+9.5d-(16.5)=0
We add all the numbers together, and all the variables
12d-21.5=0
We move all terms containing d to the left, all other terms to the right
12d=21.5
d=21.5/12
d=1+2.71428571429/3.42857142857
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