12n-3n-n-7n+n=18

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Solution for 12n-3n-n-7n+n=18 equation: 



12n-3n-n-7n+n=18

We move all terms to the left:

12n-3n-n-7n+n-(18)=0

We add all the numbers together, and all the variables

2n-18=0

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

2n=18

n=18/2

n=9

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