N-4=2n-21

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Solution for N-4=2n-21 equation: 



-4=2N-21

We move all terms to the left:

-4-(2N-21)=0

We get rid of parentheses

-2N+21-4=0

We add all the numbers together, and all the variables

-2N+17=0

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

-2N=-17

N=-17/-2

N=8+1/2

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