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3.2+1.6d=40
We move all terms to the left:
3.2+1.6d-(40)=0
We add all the numbers together, and all the variables
1.6d-36.8=0
We move all terms containing d to the left, all other terms to the right
1.6d=36.8
d=36.8/1.6
d=22+1/1
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