9-4n=-n+3(n-7)

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Solution for 9-4n=-n+3(n-7) equation: 



9-4n=-n+3(n-7)

We move all terms to the left:

9-4n-(-n+3(n-7))=0



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

-n+3(n-7)

We add all the numbers together, and all the variables

-1n+3(n-7)

We multiply parentheses

-1n+3n-21

We add all the numbers together, and all the variables

2n-21

Back to the equation:

-(2n-21)



We get rid of parentheses

-4n-2n+21+9=0

We add all the numbers together, and all the variables

-6n+30=0

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

-6n=-30

n=-30/-6

n=+5

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