21n-21=-21+21n

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Solution for 21n-21=-21+21n equation: 



21n-21=-21+21n

We move all terms to the left:

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

We add all the numbers together, and all the variables

21n-(21n-21)-21=0

We get rid of parentheses

21n-21n+21-21=0

We add all the numbers together, and all the variables

=0

n=0/1

n=0

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