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+(P+3)+(P+6)=27
We move all terms to the left:
+(P+3)+(P+6)-(27)=0
We get rid of parentheses
P+P+3+6-27=0
We add all the numbers together, and all the variables
2P-18=0
We move all terms containing P to the left, all other terms to the right
2P=18
P=18/2
P=9
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