-5n+21=3+4n

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



-5n+21=3+4n

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-9n+18=0

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

-9n=-18

n=-18/-9

n=+2

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