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4/5 - 3/10 = 8/10 - 3/10 = 5/10 = 1/2
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7/10 - 4/10 = 3/10
4/5 - 2/10 = 4/5 - 1/5 = 3/5
-5/10 + 8/10 = 3/10
4/9 minus 3/4 equals -11/36
5/6 - 3/4 = 10/12 - 9/12 = 1/12.