Solutions by everydaycalculation.com
1st number: 30/42, 2nd number: 1 19/21
3042 - 4021 is -2521.
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Related: 60/42-40/21 30/42-80/21 30/84-40/21 30/42-40/42 90/42-40/21 30/42-40/63
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