81=9-8y

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Solution for 81=9-8y equation: 



81=9-8y

We move all terms to the left:

81-(9-8y)=0

We add all the numbers together, and all the variables

-(-8y+9)+81=0

We get rid of parentheses

8y-9+81=0

We add all the numbers together, and all the variables

8y+72=0

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

8y=-72

y=-72/8

y=-9

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