13=9+3y

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Solution for 13=9+3y equation: 



13=9+3y

We move all terms to the left:

13-(9+3y)=0

We add all the numbers together, and all the variables

-(3y+9)+13=0

We get rid of parentheses

-3y-9+13=0

We add all the numbers together, and all the variables

-3y+4=0

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

-3y=-4

y=-4/-3

y=1+1/3

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