9+2n=-9

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Solution for 9+2n=-9 equation: 



9+2n=-9

We move all terms to the left:

9+2n-(-9)=0

We add all the numbers together, and all the variables

2n+18=0

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

2n=-18

n=-18/2

n=-9

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