-21+6n=-3n+6(n-7)

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Solution for -21+6n=-3n+6(n-7) equation: 



-21+6n=-3n+6(n-7)

We move all terms to the left:

-21+6n-(-3n+6(n-7))=0



We calculate terms in parentheses: -(-3n+6(n-7)), so:

-3n+6(n-7)

We multiply parentheses

-3n+6n-42

We add all the numbers together, and all the variables

3n-42

Back to the equation:

-(3n-42)



We get rid of parentheses

6n-3n+42-21=0

We add all the numbers together, and all the variables

3n+21=0

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

3n=-21

n=-21/3

n=-7

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