9/7 is already an improper fraction!
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66/7
9 / (3/7) = 9 * (7/3) = 21 which is an integer, not an improper fraction.
Three and four sevenths in an improper fraction is 17857/5000
Two and four sevenths as an improper fraction = 12857/5000
Two and three sevenths is "31/7", read "Thirty-one sevenths" in improper form.