5n=21-2n

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Solution for 5n=21-2n equation: 



5n=21-2n

We move all terms to the left:

5n-(21-2n)=0

We add all the numbers together, and all the variables

5n-(-2n+21)=0

We get rid of parentheses

5n+2n-21=0

We add all the numbers together, and all the variables

7n-21=0

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

7n=21

n=21/7

n=3

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