4n(-5)=21

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Solution for 4n(-5)=21 equation: 



4n(-5)=21

We move all terms to the left:

4n(-5)-(21)=0

We multiply parentheses

-20n-21=0

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

-20n=21

n=21/-20

n=-1+1/20

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