3n+21=8n-4

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Solution for 3n+21=8n-4 equation: 



3n+21=8n-4

We move all terms to the left:

3n+21-(8n-4)=0

We get rid of parentheses

3n-8n+4+21=0

We add all the numbers together, and all the variables

-5n+25=0

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

-5n=-25

n=-25/-5

n=+5

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