3y+9=9y-18

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Solution for 3y+9=9y-18 equation: 



3y+9=9y-18

We move all terms to the left:

3y+9-(9y-18)=0

We get rid of parentheses

3y-9y+18+9=0

We add all the numbers together, and all the variables

-6y+27=0

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

-6y=-27

y=-27/-6

y=4+1/2

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