21-2n=3+n

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Solution for 21-2n=3+n equation: 



21-2n=3+n

We move all terms to the left:

21-2n-(3+n)=0

We add all the numbers together, and all the variables

-2n-(n+3)+21=0

We get rid of parentheses

-2n-n-3+21=0

We add all the numbers together, and all the variables

-3n+18=0

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

-3n=-18

n=-18/-3

n=+6

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