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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