15=3y-9-y

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Solution for 15=3y-9-y equation: 



15=3y-9-y

We move all terms to the left:

15-(3y-9-y)=0

We add all the numbers together, and all the variables

-(2y-9)+15=0

We get rid of parentheses

-2y+9+15=0

We add all the numbers together, and all the variables

-2y+24=0

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

-2y=-24

y=-24/-2

y=+12

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