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10.4=16.5d
We move all terms to the left:
10.4-(16.5d)=0
We add all the numbers together, and all the variables
-(+16.5d)+10.4=0
We get rid of parentheses
-16.5d+10.4=0
We move all terms containing d to the left, all other terms to the right
-16.5d=-10.4
d=-10.4/-16.5
d=4.3333333333333/6.875
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