N+n+5+n+4=21

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Solution for N+n+5+n+4=21 equation: 



+N+5+N+4=21

We move all terms to the left:

+N+5+N+4-(21)=0

We add all the numbers together, and all the variables

2N-12=0

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

2N=12

N=12/2

N=6

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