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21.7-d=5d
We move all terms to the left:
21.7-d-(5d)=0
We add all the numbers together, and all the variables
-6d+21.7=0
We move all terms containing d to the left, all other terms to the right
-6d=-21.7
d=-21.7/-6
d=3+1/1.6216216216216
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