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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

3(-2n-2)

We multiply parentheses

-6n-6

Back to the equation:

-(-6n-6)



We get rid of parentheses

-1n+6n+6-21=0

We add all the numbers together, and all the variables

5n-15=0

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

5n=15

n=15/5

n=3

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