-8=-n+3n

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Solution for -8=-n+3n equation: 



-8=-n+3n

We move all terms to the left:

-8-(-n+3n)=0

We add all the numbers together, and all the variables

-(+2n)-8=0

We get rid of parentheses

-2n-8=0

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

-2n=8

n=8/-2

n=-4

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