-28=7n+21

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Solution for -28=7n+21 equation: 



-28=7n+21

We move all terms to the left:

-28-(7n+21)=0

We get rid of parentheses

-7n-21-28=0

We add all the numbers together, and all the variables

-7n-49=0

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

-7n=49

n=49/-7

n=-7

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