17=21-4n

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Solution for 17=21-4n equation: 



17=21-4n

We move all terms to the left:

17-(21-4n)=0

We add all the numbers together, and all the variables

-(-4n+21)+17=0

We get rid of parentheses

4n-21+17=0

We add all the numbers together, and all the variables

4n-4=0

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

4n=4

n=4/4

n=1

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