7/15 − 4/9 = 3/135 which reduces to 1/45
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43 minus 27 3/7 = 15 4/7
4/5 minus 1/3 = 7/15
8/15 minus 7/20 is 11/60
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
21/30 - 8/30 = 13/30