P(20)=7k-5

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Solution for P(20)=7k-5 equation: 



(20)=7P-5

We move all terms to the left:

(20)-(7P-5)=0

We get rid of parentheses

-7P+5+20=0

We add all the numbers together, and all the variables

-7P+25=0

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

-7P=-25

P=-25/-7

P=3+4/7

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