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=21+2P
We move all terms to the left:
-(21+2P)=0
We add all the numbers together, and all the variables
-(2P+21)=0
We get rid of parentheses
-2P-21=0
We move all terms containing P to the left, all other terms to the right
-2P=21
P=21/-2
P=-10+1/2
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