12=13+n

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Solution for 12=13+n equation: 



12=13+n

We move all terms to the left:

12-(13+n)=0

We add all the numbers together, and all the variables

-(n+13)+12=0

We get rid of parentheses

-n-13+12=0

We add all the numbers together, and all the variables

-1n-1=0

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

-n=1

n=1/-1

n=-1

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