9=3n+7

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Solution for 9=3n+7 equation: 



9=3n+7

We move all terms to the left:

9-(3n+7)=0

We get rid of parentheses

-3n-7+9=0

We add all the numbers together, and all the variables

-3n+2=0

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

-3n=-2

n=-2/-3

n=2/3

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