-15=6+3y

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Solution for -15=6+3y equation: 



-15=6+3y

We move all terms to the left:

-15-(6+3y)=0

We add all the numbers together, and all the variables

-(3y+6)-15=0

We get rid of parentheses

-3y-6-15=0

We add all the numbers together, and all the variables

-3y-21=0

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

-3y=21

y=21/-3

y=-7

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