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(P)=3P-12
We move all terms to the left:
(P)-(3P-12)=0
We get rid of parentheses
P-3P+12=0
We add all the numbers together, and all the variables
-2P+12=0
We move all terms containing P to the left, all other terms to the right
-2P=-12
P=-12/-2
P=+6
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