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30.6=0.1d+3.4
We move all terms to the left:
30.6-(0.1d+3.4)=0
We get rid of parentheses
-0.1d-3.4+30.6=0
We add all the numbers together, and all the variables
-0.1d+27.2=0
We move all terms containing d to the left, all other terms to the right
-0.1d=-27.2
d=-27.2/-0.1
d=272+-3.5527136788005E-15/0.1
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