3n+80=21n-100

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Solution for 3n+80=21n-100 equation: 



3n+80=21n-100

We move all terms to the left:

3n+80-(21n-100)=0

We get rid of parentheses

3n-21n+100+80=0

We add all the numbers together, and all the variables

-18n+180=0

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

-18n=-180

n=-180/-18

n=+10

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