7n+28=21

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Solution for 7n+28=21 equation: 



7n+28=21

We move all terms to the left:

7n+28-(21)=0

We add all the numbers together, and all the variables

7n+7=0

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

7n=-7

n=-7/7

n=-1

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