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39.1=D3.2
We move all terms to the left:
39.1-(D3.2)=0
We add all the numbers together, and all the variables
-(+D3.2)+39.1=0
We get rid of parentheses
-D3.2+39.1=0
We move all terms containing D to the left, all other terms to the right
-D3.2=-39.1
D=-39.1/1
D=-39.1
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