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\[8\frac{2}{7}-(3\frac{4}{9}+4\frac{2}{7})\]
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mixed(8,2/7)-(mixed(3,4/9)+mixed(4,2/7))
8&2/7-(3&4/9+4&2/7)
8\frac{2}{7}-(3\frac{4}{9}+4\frac{2}{7})
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