Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 9/15
1621 - 2415 is -88105.
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Related: 32/21-24/15 16/21-48/15 16/42-24/15 16/21-24/30 48/21-24/15 16/21-72/15 16/63-24/15 16/21-24/45 80/21-24/15 16/21-24/75
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