21=5n-9

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Solution for 21=5n-9 equation: 



21=5n-9

We move all terms to the left:

21-(5n-9)=0

We get rid of parentheses

-5n+9+21=0

We add all the numbers together, and all the variables

-5n+30=0

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

-5n=-30

n=-30/-5

n=+6

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