2n+n=-9

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Solution for 2n+n=-9 equation: 



2n+n=-9

We move all terms to the left:

2n+n-(-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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