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=21+2P(P)
We move all terms to the left:
-(21+2P(P))=0
We add all the numbers together, and all the variables
-(2PP+21)=0
We get rid of parentheses
-2PP-21=0
We move all terms containing P to the left, all other terms to the right
-2PP=21
P=21/1
P=21
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