21=21+9y

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Solution for 21=21+9y equation: 



21=21+9y

We move all terms to the left:

21-(21+9y)=0

We add all the numbers together, and all the variables

-(9y+21)+21=0

We get rid of parentheses

-9y-21+21=0

We add all the numbers together, and all the variables

-9y=0

y=0/-9

y=0

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