21=1+2n+8n

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Solution for 21=1+2n+8n equation: 



21=1+2n+8n

We move all terms to the left:

21-(1+2n+8n)=0

We add all the numbers together, and all the variables

-(10n+1)+21=0

We get rid of parentheses

-10n-1+21=0

We add all the numbers together, and all the variables

-10n+20=0

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

-10n=-20

n=-20/-10

n=+2

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