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68.4=5.7d
We move all terms to the left:
68.4-(5.7d)=0
We add all the numbers together, and all the variables
-(+5.7d)+68.4=0
We get rid of parentheses
-5.7d+68.4=0
We move all terms containing d to the left, all other terms to the right
-5.7d=-68.4
d=-68.4/-5.7
d=+12
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