9y-9=90

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Solution for 9y-9=90 equation: 



9y-9=90

We move all terms to the left:

9y-9-(90)=0

We add all the numbers together, and all the variables

9y-99=0

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

9y=99

y=99/9

y=11

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