9=3y+4(y-3)

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Solution for 9=3y+4(y-3) equation: 



9=3y+4(y-3)

We move all terms to the left:

9-(3y+4(y-3))=0



We calculate terms in parentheses: -(3y+4(y-3)), so:

3y+4(y-3)

We multiply parentheses

3y+4y-12

We add all the numbers together, and all the variables

7y-12

Back to the equation:

-(7y-12)



We get rid of parentheses

-7y+12+9=0

We add all the numbers together, and all the variables

-7y+21=0

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

-7y=-21

y=-21/-7

y=+3

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