Solutions by everydaycalculation.com
1st number: 16/20, 2nd number: 2 0/20
1620 - 4020 is -65.
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Related: 32/20-40/20 16/20-80/20 16/40-40/20 48/20-40/20 16/60-40/20 16/20-40/60 80/20-40/20
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