9=y+y

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Solution for 9=y+y equation: 



9=y+y

We move all terms to the left:

9-(y+y)=0

We add all the numbers together, and all the variables

-(+2y)+9=0

We get rid of parentheses

-2y+9=0

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

-2y=-9

y=-9/-2

y=4+1/2

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