817
I just cited myself.
(mander.xyz)
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They multiplied both sides by 10.
0.9999... times 10 is 9.9999...
X times 10 is 10x.
10x is 9.9999999....
As I said, they didn't substitute on both sides, only one, thus breaking the rules around rearranging algebra. Anything you do to one side you have to do to the other.