9y=27-21

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Solution for 9y=27-21 equation: 



9y=27-21

We move all terms to the left:

9y-(27-21)=0

We add all the numbers together, and all the variables

9y-6=0

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

9y=6

y=6/9

y=2/3

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