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81.9=6.3d
We move all terms to the left:
81.9-(6.3d)=0
We add all the numbers together, and all the variables
-(+6.3d)+81.9=0
We get rid of parentheses
-6.3d+81.9=0
We move all terms containing d to the left, all other terms to the right
-6.3d=-81.9
d=-81.9/-6.3
d=13+1.4210854715202E-14/6.3
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