9=7+n

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Solution for 9=7+n equation: 



9=7+n

We move all terms to the left:

9-(7+n)=0

We add all the numbers together, and all the variables

-(n+7)+9=0

We get rid of parentheses

-n-7+9=0

We add all the numbers together, and all the variables

-1n+2=0

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

-n=-2

n=-2/-1

n=+2

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