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81=13.5p
We move all terms to the left:
81-(13.5p)=0
We add all the numbers together, and all the variables
-(+13.5p)+81=0
We get rid of parentheses
-13.5p+81=0
We move all terms containing p to the left, all other terms to the right
-13.5p=-81
p=-81/-13.5
p=+6
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