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4.1=d-6.9
We move all terms to the left:
4.1-(d-6.9)=0
We get rid of parentheses
-d+6.9+4.1=0
We add all the numbers together, and all the variables
-1d+11=0
We move all terms containing d to the left, all other terms to the right
-d=-11
d=-11/-1
d=+11
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