21=6y+3(y-8)

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Solution for 21=6y+3(y-8) equation: 



21=6y+3(y-8)

We move all terms to the left:

21-(6y+3(y-8))=0



We calculate terms in parentheses: -(6y+3(y-8)), so:

6y+3(y-8)

We multiply parentheses

6y+3y-24

We add all the numbers together, and all the variables

9y-24

Back to the equation:

-(9y-24)



We get rid of parentheses

-9y+24+21=0

We add all the numbers together, and all the variables

-9y+45=0

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

-9y=-45

y=-45/-9

y=+5

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