N=2n-21

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Solution for N=2n-21 equation: 



=2N-21

We move all terms to the left:

-(2N-21)=0

We get rid of parentheses

-2N+21=0

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

-2N=-21

N=-21/-2

N=10+1/2

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