21y-9=3(7y-3)

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Solution for 21y-9=3(7y-3) equation: 



21y-9=3(7y-3)

We move all terms to the left:

21y-9-(3(7y-3))=0



We calculate terms in parentheses: -(3(7y-3)), so:

3(7y-3)

We multiply parentheses

21y-9

Back to the equation:

-(21y-9)



We get rid of parentheses

21y-21y+9-9=0

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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