7(n+)=21

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Solution for 7(n+)=21 equation: 



7(n+)=21

We move all terms to the left:

7(n+)-(21)=0

We add all the numbers together, and all the variables

7(+n)-21=0

We multiply parentheses

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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