Solutions by everydaycalculation.com
1st number: 8/20, 2nd number: 1 4/20
820 - 2420 is -45.
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Related: 16/20-24/20 8/20-48/20 8/40-24/20 8/20-24/40 24/20-24/20 8/20-72/20 8/60-24/20 8/20-24/60 40/20-24/20 56/20-24/20
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