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18 - 1/10 = 17 i 10/10 - 1/10 = 17 i 9.10
21 i 1/4 - 3 i 5/9 = 21 i 9/36 - 3 i 20/36 = 20 i 45/36 - 3 i 20/36 = 17 i 25/36
2) 17 9/10
3) 21 9/36 - 3 20/36=17 11/36