N+3n-n=18

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Solution for N+3n-n=18 equation: 



+3N-N=18

We move all terms to the left:

+3N-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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