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Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
Unfortunately, 2 over 2 minus 1 equals 5 over 6 is just a wrong answer! If it is 2 over 2, minus 1, the answer is that it equals zero. If it is 2, over 2 minus 1, the answer is that it equals 2.
2 minus 2/5 plus 1/2 minus 4 = -1.9
19/20 minus 11/12 = 1/30
11/12 minus 7/12 is 1/3