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2/7 + 4/9  = 18/63 + 28/63 =  46/63

3/8 - 5 /3 =  9/24 - 40/24 =  - 31 /24

- 4/5 - 7 /9  = - 36/45 - 35/45 = - 71/45

1 + 2/9  = 9 /9 + 2 /9 =  11/9

1 - 7 /3  = 3 /3 - 7 /3 = - 4 /3

3 + 3 /4 = 12/4 + 3 /4 = 15 /4

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