3(n+7)-7n=0

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Solution for 3(n+7)-7n=0 equation: 



3(n+7)-7n=0

We add all the numbers together, and all the variables

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

We multiply parentheses

-7n+3n+21=0

We add all the numbers together, and all the variables

-4n+21=0

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

-4n=-21

n=-21/-4

n=5+1/4

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