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9y+15=-4(y+6)

We move all terms to the left:

9y+15-(-4(y+6))=0

We calculate terms in parentheses: -(-4(y+6)), so:We get rid of parentheses

-4(y+6)

We multiply parentheses

-4y-24

Back to the equation:

-(-4y-24)

9y+4y+24+15=0

We add all the numbers together, and all the variables

13y+39=0

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

13y=-39

y=-39/13

y=-3

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