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 get rid of parentheses

-y-9+12=0

We add all the numbers together, and all the variables

-1y+3=0

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

-y=-3

y=-3/-1

y=+3

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