81=10y-y

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Solution for 81=10y-y equation: 



81=10y-y

We move all terms to the left:

81-(10y-y)=0

We add all the numbers together, and all the variables

-(+9y)+81=0

We get rid of parentheses

-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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