(3y-9)=81

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Solution for (3y-9)=81 equation: 



(3y-9)=81

We move all terms to the left:

(3y-9)-(81)=0

We get rid of parentheses

3y-9-81=0

We add all the numbers together, and all the variables

3y-90=0

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

3y=90

y=90/3

y=30

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