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81=9p-63
We move all terms to the left:
81-(9p-63)=0
We get rid of parentheses
-9p+63+81=0
We add all the numbers together, and all the variables
-9p+144=0
We move all terms containing p to the left, all other terms to the right
-9p=-144
p=-144/-9
p=+16
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