81=3(7p-1)

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Solution for 81=3(7p-1) equation: 



81=3(7p-1)

We move all terms to the left:

81-(3(7p-1))=0



We calculate terms in parentheses: -(3(7p-1)), so:

3(7p-1)

We multiply parentheses

21p-3

Back to the equation:

-(21p-3)



We get rid of parentheses

-21p+3+81=0

We add all the numbers together, and all the variables

-21p+84=0

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

-21p=-84

p=-84/-21

p=+4

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