2/3 x 2/5 + 1/3 - 1/5 x 5/4
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>>>2/3 × 2/5 = 4/15
>>>-1/5 × 5/4 = - 5/20
>>> 4/15 + 1/3 - 5/20
>>> 16/60 + 20/60 - 15/60 =36/60 - 15/60 =
>>>2/3 × 2/5 = 4/15
>>>-1/5 × 5/4 = - 5/20
>>> 4/15 + 1/3 - 5/20
>>> 16/60 + 20/60 - 15/60 =36/60 - 15/60 =
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