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It would depend on where you put the parentheses. 7/9 - 9 is a rational number 7/(9-9) is not even a number at all - surely not a rational number.
Actually, 9 is NOT a prime number.
9 enlarged by a factor of a number is 9*y
9/1 = 9, which is an integer, NOT a mixed number.
The number is: 9*9*9 = 729