Solutions by everydaycalculation.com
1st number: 8/20, 2nd number: 2 0/20
820 - 4020 is -85.
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Related: 16/20-40/20 8/20-80/20 8/40-40/20 24/20-40/20 8/60-40/20 8/20-40/60 40/20-40/20 56/20-40/20
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