19=21-n

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Solution for 19=21-n equation: 



19=21-n

We move all terms to the left:

19-(21-n)=0

We add all the numbers together, and all the variables

-(-1n+21)+19=0

We get rid of parentheses

1n-21+19=0

We add all the numbers together, and all the variables

n-2=0

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

n=2

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