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x is an arbitrary variable in an elementary equation such as:
y = 2x
u or any other variable could be used in place of x, but consistency is key!
y = 2u
guess this might help...
It is because when Algebra was discovered, it was discovered by Muhammad ibn Mūsā al-Khwārizmī and Arab Mathematician in the 7 th Century. When X is translated into Arabic it means "thing". Thus when algebra spread to the Western World, the Arabic word of "thing" was translated into what we know today as "X".