Solutions by everydaycalculation.com
1st number: 14/21, 2nd number: 4 6/21
1421 - 9021 is -7621.
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Related: 28/21-90/21 14/42-90/21 14/21-90/42 42/21-90/21 14/63-90/21 14/21-90/63 70/21-90/21 98/21-90/21
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