3=-n+2n

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Solution for 3=-n+2n equation: 



3=-n+2n

We move all terms to the left:

3-(-n+2n)=0

We add all the numbers together, and all the variables

-(+n)+3=0

We get rid of parentheses

-n+3=0

We add all the numbers together, and all the variables

-1n+3=0

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

-n=-3

n=-3/-1

n=+3

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