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30.2-40d=20.3d+30
We move all terms to the left:
30.2-40d-(20.3d+30)=0
We get rid of parentheses
-40d-20.3d-30+30.2=0
We add all the numbers together, and all the variables
-60.3d+0.2=0
We move all terms containing d to the left, all other terms to the right
-60.3d=-0.2
d=-0.2/-60.3
d=0.2/60.3
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