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-27.5=2.5d
We move all terms to the left:
-27.5-(2.5d)=0
We add all the numbers together, and all the variables
-(+2.5d)-27.5=0
We get rid of parentheses
-2.5d-27.5=0
We move all terms containing d to the left, all other terms to the right
-2.5d=27.5
d=27.5/-2.5
d=-11
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