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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(3(2n+1)+6n), so:

3(2n+1)+6n

We add all the numbers together, and all the variables

6n+3(2n+1)

We multiply parentheses

6n+6n+3

We add all the numbers together, and all the variables

12n+3

Back to the equation:

-(12n+3)



We get rid of parentheses

6n-12n-3-21=0

We add all the numbers together, and all the variables

-6n-24=0

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

-6n=24

n=24/-6

n=-4

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