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8.1=d-6.1
We move all terms to the left:
8.1-(d-6.1)=0
We get rid of parentheses
-d+6.1+8.1=0
We add all the numbers together, and all the variables
-1d+14.2=0
We move all terms containing d to the left, all other terms to the right
-d=-14.2
d=-14.2/-1
d=14+0.2/1
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