12=3+n

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Solution for 12=3+n equation: 



12=3+n

We move all terms to the left:

12-(3+n)=0

We add all the numbers together, and all the variables

-(n+3)+12=0

We get rid of parentheses

-n-3+12=0

We add all the numbers together, and all the variables

-1n+9=0

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

-n=-9

n=-9/-1

n=+9

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