4/5 + 13/2, 7/4 - 5/6, 7/3 x 2/9, 3/5 : 4/7, 2/10 + 1/5, 5/8 - 1/4, 3/4 x 10/5, 1/2 : 1/5, 12/20 + 87/20, 150/12 - 50/12, 1/2 : 1/4, 1/3 x 3/3, 5/8 x 3/2, 5/7 : 2/3.

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