It is an expression which would appear to involve two variables, x and y. However, simplification would shows that the presence of x in the expression is superfluous.
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A Film for XX was created in 1999.
Universal Newsreel - 1945 XX was released on: USA: 12 March 1945
Project XX - 1954 Meet George Washington was released on: USA: 24 April 1969
1,2,4,5,10,20 (the factors of 20)
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