20y-84=4(5y-21)

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Solution for 20y-84=4(5y-21) equation: 



20y-84=4(5y-21)

We move all terms to the left:

20y-84-(4(5y-21))=0



We calculate terms in parentheses: -(4(5y-21)), so:

4(5y-21)

We multiply parentheses

20y-84

Back to the equation:

-(20y-84)



We get rid of parentheses

20y-20y+84-84=0

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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