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-16.8d-1.89=12.7d-13.69
We move all terms to the left:
-16.8d-1.89-(12.7d-13.69)=0
We get rid of parentheses
-16.8d-12.7d+13.69-1.89=0
We add all the numbers together, and all the variables
-29.5d+11.8=0
We move all terms containing d to the left, all other terms to the right
-29.5d=-11.8
d=-11.8/-29.5
d=6.5555555555556/16.388888888889
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