-4x-21=-4x-21

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Solution for -4x-21=-4x-21 equation: 



-4x-21=-4x-21

We move all terms to the left:

-4x-21-(-4x-21)=0

We get rid of parentheses

-4x+4x+21-21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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