That would be 25/9.
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8/9 - 4/7 = 4/2 which is a improper fraction.
The mixed number 8 and 7/9 = 79/9 as an improper fraction.
It is: 2 and 2/7 = 16/7 as an improper fraction
2 and 5/7 as an improper fraction is 19/7
18/7 is the improper fraction for 2 and 4-7.