15=2y+9

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Solution for 15=2y+9 equation: 



15=2y+9

We move all terms to the left:

15-(2y+9)=0

We get rid of parentheses

-2y-9+15=0

We add all the numbers together, and all the variables

-2y+6=0

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

-2y=-6

y=-6/-2

y=+3

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