21=9y+3

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Solution for 21=9y+3 equation: 



21=9y+3

We move all terms to the left:

21-(9y+3)=0

We get rid of parentheses

-9y-3+21=0

We add all the numbers together, and all the variables

-9y+18=0

We move all terms containing y to the left, all other terms to the right

-9y=-18

y=-18/-9

y=+2

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