21=8n-(2n-3)

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Solution for 21=8n-(2n-3) equation: 



21=8n-(2n-3)

We move all terms to the left:

21-(8n-(2n-3))=0



We calculate terms in parentheses: -(8n-(2n-3)), so:

8n-(2n-3)

We get rid of parentheses

8n-2n+3

We add all the numbers together, and all the variables

6n+3

Back to the equation:

-(6n+3)



We get rid of parentheses

-6n-3+21=0

We add all the numbers together, and all the variables

-6n+18=0

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

-6n=-18

n=-18/-6

n=+3

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