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Peh said:
Teeqoz said:

Prove how it's not the same (ie. disprove my proof).

You already did. You defined 0.9999... as x. 0.999 could be also called milk if you want and milk equals 1

Nearly every single mathematical proof there is starts with stating something equivalent to "if x = 0.999... then:". If that is a valid reason to say my proof is invalid, then oh boy, we have to throw a lot of mathematics out the window! Also, the user I quoted was asking about the fraction proof, where I didn't use x at all.