15+3-12=n

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Solution for 15+3-12=n equation: 



15+3-12=n

We move all terms to the left:

15+3-12-(n)=0

We add all the numbers together, and all the variables

-1n+6=0

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

-n=-6

n=-6/-1

n=+6

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