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

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



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

We move all terms to the left:

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



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

3(n+6)-6n

We add all the numbers together, and all the variables

-6n+3(n+6)

We multiply parentheses

-6n+3n+18

We add all the numbers together, and all the variables

-3n+18

Back to the equation:

-(-3n+18)



We get rid of parentheses

-2n+3n-18+21=0

We add all the numbers together, and all the variables

n+3=0

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

n=-3

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