No, 10/5 and 18/8 are not equivalent, because 10/5 is 2, and 18/8 is 2 1/4
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10 over 18
10/18, 15/27
5/6, 10/12, 20/24
-10/18, -15/27, -20/36
five over nine is 10 over 18, five over six is 15 over 18, 10-15=-5 over -18 .....-5 18