21y-9=3(6y-1)

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Solution for 21y-9=3(6y-1) equation: 



21y-9=3(6y-1)

We move all terms to the left:

21y-9-(3(6y-1))=0



We calculate terms in parentheses: -(3(6y-1)), so:

3(6y-1)

We multiply parentheses

18y-3

Back to the equation:

-(18y-3)



We get rid of parentheses

21y-18y+3-9=0

We add all the numbers together, and all the variables

3y-6=0

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

3y=6

y=6/3

y=2

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