9x-21=9x+21

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Solution for 9x-21=9x+21 equation: 



9x-21=9x+21

We move all terms to the left:

9x-21-(9x+21)=0

We get rid of parentheses

9x-9x-21-21=0

We add all the numbers together, and all the variables

-42!=0

There is no solution for this equation

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