(2/3) + (1/5),  (3/8), (2x2/ 2x3) + ( 3x1/ 3x5), (7/21), (4/1) + (3/2), (7/3), (-2/3 ) + (5/ -1), (3/2), (2x (-2)/ 2 x 3) - (5/ -1), (1/5).

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