unknown quantity, unknown, variable, mystery, n, y; see also quantity.
"x." YourDictionary, n.d. Web. 22 June 2018. <http://thesaurus.yourdictionary.com/x>.
x. (n.d.). Retrieved June 22nd, 2018, from http://thesaurus.yourdictionary.com/x
To remove or invalidate by or as if by running a line through or wiping clean.
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