-2n-21=-(n-7)-5n

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Solution for -2n-21=-(n-7)-5n equation: 



-2n-21=-(n-7)-5n

We move all terms to the left:

-2n-21-(-(n-7)-5n)=0



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

-(n-7)-5n

We add all the numbers together, and all the variables

-5n-(n-7)

We get rid of parentheses

-5n-n+7

We add all the numbers together, and all the variables

-6n+7

Back to the equation:

-(-6n+7)



We get rid of parentheses

-2n+6n-7-21=0

We add all the numbers together, and all the variables

4n-28=0

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

4n=28

n=28/4

n=7

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