9y+21=9y+21

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Solution for 9y+21=9y+21 equation: 



9y+21=9y+21

We move all terms to the left:

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

We get rid of parentheses

9y-9y-21+21=0

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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