-21=-21-x

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Solution for -21=-21-x equation: 



-21=-21-x

We move all terms to the left:

-21-(-21-x)=0

We add all the numbers together, and all the variables

-(-1x-21)-21=0

We get rid of parentheses

1x+21-21=0

We add all the numbers together, and all the variables

x=0

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