P(x)=8x-21

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Solution for P(x)=8x-21 equation: 



(P)=8P-21

We move all terms to the left:

(P)-(8P-21)=0

We get rid of parentheses

P-8P+21=0

We add all the numbers together, and all the variables

-7P+21=0

We move all terms containing P to the left, all other terms to the right

-7P=-21

P=-21/-7

P=+3

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