39=-3(21-y)+3(y-4)

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Solution for 39=-3(21-y)+3(y-4) equation: 



39=-3(21-y)+3(y-4)

We move all terms to the left:

39-(-3(21-y)+3(y-4))=0

We add all the numbers together, and all the variables

-(-3(-1y+21)+3(y-4))+39=0



We calculate terms in parentheses: -(-3(-1y+21)+3(y-4)), so:

-3(-1y+21)+3(y-4)

We multiply parentheses

3y+3y-63-12

We add all the numbers together, and all the variables

6y-75

Back to the equation:

-(6y-75)



We get rid of parentheses

-6y+75+39=0

We add all the numbers together, and all the variables

-6y+114=0

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

-6y=-114

y=-114/-6

y=+19

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