21=3+4n=

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Solution for 21=3+4n= equation: 



21=3+4n=

We move all terms to the left:

21-(3+4n)=0

We add all the numbers together, and all the variables

-(4n+3)+21=0

We get rid of parentheses

-4n-3+21=0

We add all the numbers together, and all the variables

-4n+18=0

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

-4n=-18

n=-18/-4

n=4+1/2

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