18=9-3y

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Solution for 18=9-3y equation: 



18=9-3y

We move all terms to the left:

18-(9-3y)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3y-9+18=0

We add all the numbers together, and all the variables

3y+9=0

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

3y=-9

y=-9/3

y=-3

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