divide the sum of 13/5 and -12/7 by the product of -31/7 and 1/-2.
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Required number= {13/5+(-12/7)} / {(-31/7) * (1/_2)}
= (13/5-12/7) / {(-31/7)*(-1/2)}
= (91-60)/35 / 31/14
= 31/35 / 31/14
= 31/35 * 14/31
= 1/5 * 2
= 2/5
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