8n+2n+4n+n-12n=15

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Solution for 8n+2n+4n+n-12n=15 equation: 



8n+2n+4n+n-12n=15

We move all terms to the left:

8n+2n+4n+n-12n-(15)=0

We add all the numbers together, and all the variables

3n-15=0

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

3n=15

n=15/3

n=5

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