-9y-15=3y+21

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Solution for -9y-15=3y+21 equation: 



-9y-15=3y+21

We move all terms to the left:

-9y-15-(3y+21)=0

We get rid of parentheses

-9y-3y-21-15=0

We add all the numbers together, and all the variables

-12y-36=0

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

-12y=36

y=36/-12

y=-3

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