Solutions by everydaycalculation.com
1st number: 1 8/20, 2nd number: 4 10/20
2820 - 9020 is -3110.
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Related: 56/20-90/20 28/40-90/20 28/20-90/40 84/20-90/20 28/60-90/20 28/20-90/60
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