-9=-3(5+y)+15

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Solution for -9=-3(5+y)+15 equation: 



-9=-3(5+y)+15

We move all terms to the left:

-9-(-3(5+y)+15)=0

We add all the numbers together, and all the variables

-(-3(y+5)+15)-9=0



We calculate terms in parentheses: -(-3(y+5)+15), so:

-3(y+5)+15

We multiply parentheses

-3y-15+15

We add all the numbers together, and all the variables

-3y

Back to the equation:

-(-3y)



We get rid of parentheses

3y-9=0

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

3y=9

y=9/3

y=3

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