0=3n+9n

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Solution for 0=3n+9n equation: 



0=3n+9n

We move all terms to the left:

0-(3n+9n)=0

We add all the numbers together, and all the variables

-(+12n)+0=0

We add all the numbers together, and all the variables

-(+12n)=0

We get rid of parentheses

-12n=0

n=0/-12

n=0

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