The mixed number 8 and 7/9 = 79/9 as an improper fraction.
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If you are using the same number, then the improper fraction and mixed number are equal.
Improper Fraction.
43 is an integer, not an improper fraction nor a mixed number.
A mixed number can be changed into an improper fraction
First you would want to change the mixed number to an improper fraction. Then you can subtract