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7.3=3.9d
We move all terms to the left:
7.3-(3.9d)=0
We add all the numbers together, and all the variables
-(+3.9d)+7.3=0
We get rid of parentheses
-3.9d+7.3=0
We move all terms containing d to the left, all other terms to the right
-3.9d=-7.3
d=-7.3/-3.9
d=1+1/1.1470588235294
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