6n-21=-2n-(1-3n)

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Solution for 6n-21=-2n-(1-3n) equation: 



6n-21=-2n-(1-3n)

We move all terms to the left:

6n-21-(-2n-(1-3n))=0

We add all the numbers together, and all the variables

6n-(-2n-(-3n+1))-21=0



We calculate terms in parentheses: -(-2n-(-3n+1)), so:

-2n-(-3n+1)

We get rid of parentheses

-2n+3n-1

We add all the numbers together, and all the variables

n-1

Back to the equation:

-(n-1)



We get rid of parentheses

6n-n+1-21=0

We add all the numbers together, and all the variables

5n-20=0

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

5n=20

n=20/5

n=4

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