81=3(7+5n)-3n

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Solution for 81=3(7+5n)-3n equation: 



81=3(7+5n)-3n

We move all terms to the left:

81-(3(7+5n)-3n)=0

We add all the numbers together, and all the variables

-(3(5n+7)-3n)+81=0



We calculate terms in parentheses: -(3(5n+7)-3n), so:

3(5n+7)-3n

We add all the numbers together, and all the variables

-3n+3(5n+7)

We multiply parentheses

-3n+15n+21

We add all the numbers together, and all the variables

12n+21

Back to the equation:

-(12n+21)



We get rid of parentheses

-12n-21+81=0

We add all the numbers together, and all the variables

-12n+60=0

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

-12n=-60

n=-60/-12

n=+5

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