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Yes - it simplifies to 7 over 24
72/42 = 12/7
47/72 is already simplified
21 over 72, or 7 over 24 (simplified)
-13/72 cannot be simplified.
It is: 72/96 = 3/4 simplified
55/72
No.
21 over 24 simplified is 7/8.
No, it cannot.
72/100 = 18/25
72/83 is simplified.
It is: 72/66 = 12/11