9s-9=90

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Solution for 9s-9=90 equation: 



9s-9=90

We move all terms to the left:

9s-9-(90)=0

We add all the numbers together, and all the variables

9s-99=0

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

9s=99

s=99/9

s=11

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