Question is: If x-0=x why dx exists? Or: What is your first idea if you see this:

Question is: If x-0=x why dx exists? Or: What is your first idea if you see this:

^^^ source: https://www.facebook.com/photo/?fbid=1675479489849979&set=a.131167747614502


Author: AarNoma

The first Slovak cyborg 1 system

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