(N-21)/2=4n

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Solution for (N-21)/2=4n equation: 



(-21)/2=4N

We move all terms to the left:

(-21)/2-(4N)=0

We multiply all the terms by the denominator


-4N*2+(-21)=0

We add all the numbers together, and all the variables

-4N*2-21=0

Wy multiply elements

-8N-21=0

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

-8N=21

N=21/-8

N=-2+5/8

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