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3 can go into both these numbers 72/3= 24 21/3= 7
The common denominator is 72, so 5/18 = 20/72, and 7/24 = 21/72. Now you can subtract the numerators [20-21 = -1]. So the answer is -1/72.
72/63 = 24/21 = 8/7
7/24
Yes - it simplifies to 7 over 24