y-9=-8y

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Solution for y-9=-8y equation: 



y-9=-8y

We move all terms to the left:

y-9-(-8y)=0

We get rid of parentheses

y+8y-9=0

We add all the numbers together, and all the variables

9y-9=0

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

9y=9

y=9/9

y=1

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