7n-21=3n+7

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Solution for 7n-21=3n+7 equation: 



7n-21=3n+7

We move all terms to the left:

7n-21-(3n+7)=0

We get rid of parentheses

7n-3n-7-21=0

We add all the numbers together, and all the variables

4n-28=0

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

4n=28

n=28/4

n=7

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