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3.80d=6.75
We move all terms to the left:
3.80d-(6.75)=0
We add all the numbers together, and all the variables
3.80d-6.75=0
We move all terms containing d to the left, all other terms to the right
3.80d=6.75
d=6.75/3.80
d=1+2.95/3.80
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