9w-21=9w-21

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Solution for 9w-21=9w-21 equation: 



9w-21=9w-21

We move all terms to the left:

9w-21-(9w-21)=0

We get rid of parentheses

9w-9w+21-21=0

We add all the numbers together, and all the variables

=0

w=0/1

w=0

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