3n+n-4n+3n=9

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Solution for 3n+n-4n+3n=9 equation: 



3n+n-4n+3n=9

We move all terms to the left:

3n+n-4n+3n-(9)=0

We add all the numbers together, and all the variables

3n-9=0

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

3n=9

n=9/3

n=3

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