-7n+4n=21

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Solution for -7n+4n=21 equation: 



-7n+4n=21

We move all terms to the left:

-7n+4n-(21)=0

We add all the numbers together, and all the variables

-3n-21=0

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

-3n=21

n=21/-3

n=-7

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