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-54.4=6.8d
We move all terms to the left:
-54.4-(6.8d)=0
We add all the numbers together, and all the variables
-(+6.8d)-54.4=0
We get rid of parentheses
-6.8d-54.4=0
We move all terms containing d to the left, all other terms to the right
-6.8d=54.4
d=54.4/-6.8
d=-8
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