-9+2n=31

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Solution for -9+2n=31 equation: 



-9+2n=31

We move all terms to the left:

-9+2n-(31)=0

We add all the numbers together, and all the variables

2n-40=0

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

2n=40

n=40/2

n=20

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