72=9(y-1)

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Solution for 72=9(y-1) equation: 



72=9(y-1)

We move all terms to the left:

72-(9(y-1))=0



We calculate terms in parentheses: -(9(y-1)), so:

9(y-1)

We multiply parentheses

9y-9

Back to the equation:

-(9y-9)



We get rid of parentheses

-9y+9+72=0

We add all the numbers together, and all the variables

-9y+81=0

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

-9y=-81

y=-81/-9

y=+9

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