8n-21=4n+7

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Solution for 8n-21=4n+7 equation: 



8n-21=4n+7

We move all terms to the left:

8n-21-(4n+7)=0

We get rid of parentheses

8n-4n-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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