divide the sum of 13/5 and -12/7 by the product od -31/7 and 1/-2
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13/5+ -12/7
=13×7/35+ -12×5/35
=91/35+ -60/35
=31/35
-31/7×1/-2
=31/14
31/35 ÷ 31/14
=31/35×14/31
=14/35
=13×7/35+ -12×5/35
=91/35+ -60/35
=31/35
-31/7×1/-2
=31/14
31/35 ÷ 31/14
=31/35×14/31
=14/35
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