21=-7n-7

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Solution for 21=-7n-7 equation: 



21=-7n-7

We move all terms to the left:

21-(-7n-7)=0

We get rid of parentheses

7n+7+21=0

We add all the numbers together, and all the variables

7n+28=0

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

7n=-28

n=-28/7

n=-4

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