31=8n-9

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Solution for 31=8n-9 equation: 



31=8n-9

We move all terms to the left:

31-(8n-9)=0

We get rid of parentheses

-8n+9+31=0

We add all the numbers together, and all the variables

-8n+40=0

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

-8n=-40

n=-40/-8

n=+5

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