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-18.5=9.5d+5.5d
We move all terms to the left:
-18.5-(9.5d+5.5d)=0
We add all the numbers together, and all the variables
-(+15d)-18.5=0
We get rid of parentheses
-15d-18.5=0
We move all terms containing d to the left, all other terms to the right
-15d=18.5
d=18.5/-15
d=-1+1/4.28571428571
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