9=y-81

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Solution for 9=y-81 equation: 



9=y-81

We move all terms to the left:

9-(y-81)=0

We get rid of parentheses

-y+81+9=0

We add all the numbers together, and all the variables

-1y+90=0

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

-y=-90

y=-90/-1

y=+90

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