N+21=35-2n

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Solution for N+21=35-2n equation: 



+21=35-2N

We move all terms to the left:

+21-(35-2N)=0

We add all the numbers together, and all the variables

-(-2N+35)+21=0

We get rid of parentheses

2N-35+21=0

We add all the numbers together, and all the variables

2N-14=0

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

2N=14

N=14/2

N=7

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