5/8 - 7/20 = 25/40 - 14/40 = 11/40
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Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
8/15 minus 7/20 is 11/60
14/20 - 3/5 = 7/10 - 6/10 = 1/10
7/20 − 1/5 = 15/100 which reduces to 3/20
It is: 2/7 minus 5/8 is = -19/56