21=-7-2n

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Solution for 21=-7-2n equation: 



21=-7-2n

We move all terms to the left:

21-(-7-2n)=0

We add all the numbers together, and all the variables

-(-2n-7)+21=0

We get rid of parentheses

2n+7+21=0

We add all the numbers together, and all the variables

2n+28=0

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

2n=-28

n=-28/2

n=-14

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