y.y-12=9

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Solution for y.y-12=9 equation: 



y.y-12=9

We move all terms to the left:

y.y-12-(9)=0

We add all the numbers together, and all the variables

y.y-21=0

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

y.y=21

y=21/1

y=21

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