N=3(n-1)21

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Solution for N=3(n-1)21 equation: 



=3(N-1)21

We move all terms to the left:

-(3(N-1)21)=0



We calculate terms in parentheses: -(3(N-1)21), so:

3(N-1)21

We multiply parentheses

63N-63

Back to the equation:

-(63N-63)



We get rid of parentheses

-63N+63=0

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

-63N=-63

N=-63/-63

N=1

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