9-2y=21

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Solution for 9-2y=21 equation: 



9-2y=21

We move all terms to the left:

9-2y-(21)=0

We add all the numbers together, and all the variables

-2y-12=0

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

-2y=12

y=12/-2

y=-6

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