-15=9y-4y

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Solution for -15=9y-4y equation: 



-15=9y-4y

We move all terms to the left:

-15-(9y-4y)=0

We add all the numbers together, and all the variables

-(+5y)-15=0

We get rid of parentheses

-5y-15=0

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

-5y=15

y=15/-5

y=-3

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