15 2/21-(2 19/21+6 16/21) = 15 2/21 - 9 14/21 = 14 23/21 - 9 2/21 = 4
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15 2/21-(2 19/21+6 16/21) = 15 2/21 - 9 14/21 = 14 23/21 - 9 2/21 = 4