18-4n=21

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Solution for 18-4n=21 equation: 



18-4n=21

We move all terms to the left:

18-4n-(21)=0

We add all the numbers together, and all the variables

-4n-3=0

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

-4n=3

n=3/-4

n=-3/4

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