N+n+n=15

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Solution for N+n+n=15 equation: 



+N+N=15

We move all terms to the left:

+N+N-(15)=0

We add all the numbers together, and all the variables

2N-15=0

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

2N=15

N=15/2

N=7+1/2

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