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13 - 9 = 4
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15 - 6 = 9 13 - 9 = 4 Therefore, 15 - 6 = 13 - 4.
24/13 - 9/13 = (24 - 9)/13 =15/13
It is: 9/10 minus 1/4 = 13/20
-4 minus 9 is -13
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