9y-21=12

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Solution for 9y-21=12 equation: 



9y-21=12

We move all terms to the left:

9y-21-(12)=0

We add all the numbers together, and all the variables

9y-33=0

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

9y=33

y=33/9

y=3+2/3

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