21-4n=13

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Solution for 21-4n=13 equation: 



21-4n=13

We move all terms to the left:

21-4n-(13)=0

We add all the numbers together, and all the variables

-4n+8=0

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

-4n=-8

n=-8/-4

n=+2

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