-9=3(y+7)-8y

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Solution for -9=3(y+7)-8y equation: 



-9=3(y+7)-8y

We move all terms to the left:

-9-(3(y+7)-8y)=0



We calculate terms in parentheses: -(3(y+7)-8y), so:

3(y+7)-8y

We add all the numbers together, and all the variables

-8y+3(y+7)

We multiply parentheses

-8y+3y+21

We add all the numbers together, and all the variables

-5y+21

Back to the equation:

-(-5y+21)



We get rid of parentheses

5y-21-9=0

We add all the numbers together, and all the variables

5y-30=0

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

5y=30

y=30/5

y=6

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