3n=4n-21

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Solution for 3n=4n-21 equation: 



3n=4n-21

We move all terms to the left:

3n-(4n-21)=0

We get rid of parentheses

3n-4n+21=0

We add all the numbers together, and all the variables

-1n+21=0

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

-n=-21

n=-21/-1

n=+21

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