1-8n-2n=21

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



1-8n-2n=21

We move all terms to the left:

1-8n-2n-(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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