31=4+3n

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Solution for 31=4+3n equation: 



31=4+3n

We move all terms to the left:

31-(4+3n)=0

We add all the numbers together, and all the variables

-(3n+4)+31=0

We get rid of parentheses

-3n-4+31=0

We add all the numbers together, and all the variables

-3n+27=0

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

-3n=-27

n=-27/-3

n=+9

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