9(y-1)=8(9+y)

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Solution for 9(y-1)=8(9+y) equation: 



9(y-1)=8(9+y)

We move all terms to the left:

9(y-1)-(8(9+y))=0

We add all the numbers together, and all the variables

9(y-1)-(8(y+9))=0

We multiply parentheses

9y-(8(y+9))-9=0



We calculate terms in parentheses: -(8(y+9)), so:

8(y+9)

We multiply parentheses

8y+72

Back to the equation:

-(8y+72)



We get rid of parentheses

9y-8y-72-9=0

We add all the numbers together, and all the variables

y-81=0

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

y=81

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