3x-21=3x-21

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Solution for 3x-21=3x-21 equation: 



3x-21=3x-21

We move all terms to the left:

3x-21-(3x-21)=0

We get rid of parentheses

3x-3x+21-21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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