21y=20(y-30)

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Solution for 21y=20(y-30) equation: 



21y=20(y-30)

We move all terms to the left:

21y-(20(y-30))=0



We calculate terms in parentheses: -(20(y-30)), so:

20(y-30)

We multiply parentheses

20y-600

Back to the equation:

-(20y-600)



We get rid of parentheses

21y-20y+600=0

We add all the numbers together, and all the variables

y+600=0

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

y=-600

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