Solutions by everydaycalculation.com
1st number: 21/56, 2nd number: 1 1/7
2156 - 87 is -4356.
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Related: 42/56-8/7 21/56-16/7 21/56-8/14 63/56-8/7 21/56-24/7 21/56-8/21 21/56-40/7 21/56-8/35 21/56-56/7 21/56-8/49
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