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[" Q.If "f(x)+2f((1)/(x))=3x,x!=0" and "...

[" Q.If "f(x)+2f((1)/(x))=3x,x!=0" and "S={x in R:f(x)=f(-x)}" ; then "S],[" A is an empty set "quad " B contains exactly one element "],[" C contains exactly two elements "quad " D contains more than two elements "]

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