7=7-n-2n

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Solution for 7=7-n-2n equation: 



7=7-n-2n

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-3n+7)+7=0

We get rid of parentheses

3n-7+7=0

We add all the numbers together, and all the variables

3n=0

n=0/3

n=0

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