Solutions by everydaycalculation.com
1st number: 21/28, 2nd number: 4 2/7
2128 - 307 is -9928.
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Related: 42/28-30/7 21/28-60/7 21/56-30/7 21/28-30/14 63/28-30/7 21/28-90/7 21/84-30/7 21/28-30/21 21/28-30/35 21/28-30/49
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