81=9(p-81)

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Solution for 81=9(p-81) equation: 



81=9(p-81)

We move all terms to the left:

81-(9(p-81))=0



We calculate terms in parentheses: -(9(p-81)), so:

9(p-81)

We multiply parentheses

9p-729

Back to the equation:

-(9p-729)



We get rid of parentheses

-9p+729+81=0

We add all the numbers together, and all the variables

-9p+810=0

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

-9p=-810

p=-810/-9

p=+90

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