9=12-3y

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Solution for 9=12-3y equation: 



9=12-3y

We move all terms to the left:

9-(12-3y)=0

We add all the numbers together, and all the variables

-(-3y+12)+9=0

We get rid of parentheses

3y-12+9=0

We add all the numbers together, and all the variables

3y-3=0

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

3y=3

y=3/3

y=1

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