N+n+n=72

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Solution for N+n+n=72 equation: 



+N+N=72

We move all terms to the left:

+N+N-(72)=0

We add all the numbers together, and all the variables

2N-72=0

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

2N=72

N=72/2

N=36

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