9=9y+3y

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Solution for 9=9y+3y equation: 



9=9y+3y

We move all terms to the left:

9-(9y+3y)=0

We add all the numbers together, and all the variables

-(+12y)+9=0

We get rid of parentheses

-12y+9=0

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

-12y=-9

y=-9/-12

y=3/4

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