11/30 + 7/4 - 127/60, 5 - 5/7 - 30/7, 11/15 x 2/-3 - -22/45, 3/7 + 1 - 10/7, 11/15 - 1/2 - 7/30, 1/9 : (-7/3) - -1/21, -5/7 x -3/10 - 3/14, -5/9 -2 - -23/9,

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