3/7(1/5-2/7)+1/3-1/2=
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3/7 ( 1/5 - 2/7 ) + 1/3 - 1/2 = 3/7 × ( - 3/35 ) + 1/3 - 1/2 = -9/245 + 1/3 - 1/2 = -299/1470
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