8/15 − 2/5 = 2/15
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2/5 minus 1/15 is 1/3
12/15 - 10/15 = 2/15
1/3 minus 2/5 is -1/15
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
2/5 − 1/10 = 15/50 which reduces to 3/10