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Anonymous
20 - 8 = 12
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8/15 minus 7/20 is 11/60
20 + 12 - 8 = 24
20 - (8 x 2) = 4
12-(-8) = 20
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.