21=4n-3

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Solution for 21=4n-3 equation: 



21=4n-3

We move all terms to the left:

21-(4n-3)=0

We get rid of parentheses

-4n+3+21=0

We add all the numbers together, and all the variables

-4n+24=0

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

-4n=-24

n=-24/-4

n=+6

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