-12-y=9

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Solution for -12-y=9 equation: 



-12-y=9

We move all terms to the left:

-12-y-(9)=0

We add all the numbers together, and all the variables

-1y-21=0

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

-y=21

y=21/-1

y=-21

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