8/5 * -4/7 - 1 5 * 2/3 + 3/4 * -4/7
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8/5{-4/7[-15(2/3+3/4)×-4/7]}
8/5{-4/7[-15(1.41)×-4/7]}
8/5{-4/7[12.08]}
8/5{-6.90}
=-11.04
8/5{-4/7[-15(1.41)×-4/7]}
8/5{-4/7[12.08]}
8/5{-6.90}
=-11.04
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