7(n-1)=21

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Solution for 7(n-1)=21 equation: 



7(n-1)=21

We move all terms to the left:

7(n-1)-(21)=0

We multiply parentheses

7n-7-21=0

We add all the numbers together, and all the variables

7n-28=0

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

7n=28

n=28/7

n=4

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