21/30 - 8/30 = 13/30
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12/15 - 10/15 = 2/15
2/3
4/5 - 8/15 = 12/15 - 8/15 = 4/15
4 3/10 - 2 4/5 = 43/10 - 14/5 = 43/10 - 28/10 = 15/10 = 1 whole 1 over 2
five over nine is 10 over 18, five over six is 15 over 18, 10-15=-5 over -18 .....-5 18