-21=3(3y-1)

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



-21=3(3y-1)

We move all terms to the left:

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



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

3(3y-1)

We multiply parentheses

9y-3

Back to the equation:

-(9y-3)



We get rid of parentheses

-9y+3-21=0

We add all the numbers together, and all the variables

-9y-18=0

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

-9y=18

y=18/-9

y=-2

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