4-(2/3+5/7) = 4 - ( 14/21 + 15/21) = 4 - 29/21 = 3 21/21 - 29/21 = 2 8/21
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4-(2/3+5/7) = 4 - ( 14/21 + 15/21) = 4 - 29/21 = 3 21/21 - 29/21 = 2 8/21