31=n+19

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Solution for 31=n+19 equation: 



31=n+19

We move all terms to the left:

31-(n+19)=0

We get rid of parentheses

-n-19+31=0

We add all the numbers together, and all the variables

-1n+12=0

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

-n=-12

n=-12/-1

n=+12

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