15=-3(y+7)

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Solution for 15=-3(y+7) equation: 



15=-3(y+7)

We move all terms to the left:

15-(-3(y+7))=0



We calculate terms in parentheses: -(-3(y+7)), so:

-3(y+7)

We multiply parentheses

-3y-21

Back to the equation:

-(-3y-21)



We get rid of parentheses

3y+21+15=0

We add all the numbers together, and all the variables

3y+36=0

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

3y=-36

y=-36/3

y=-12

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