P=2a+21

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Solution for P=2a+21 equation: 



=2P+21

We move all terms to the left:

-(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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