21=3+4n+5

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Solution for 21=3+4n+5 equation: 



21=3+4n+5

We move all terms to the left:

21-(3+4n+5)=0

We add all the numbers together, and all the variables

-(4n+8)+21=0

We get rid of parentheses

-4n-8+21=0

We add all the numbers together, and all the variables

-4n+13=0

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

-4n=-13

n=-13/-4

n=3+1/4

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