27=12y-9y

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Solution for 27=12y-9y equation: 



27=12y-9y

We move all terms to the left:

27-(12y-9y)=0

We add all the numbers together, and all the variables

-(+3y)+27=0

We get rid of parentheses

-3y+27=0

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

-3y=-27

y=-27/-3

y=+9

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