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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