Solutions by everydaycalculation.com
1st number: 1 8/20, 2nd number: 1 15/20
2820 - 3520 is -720.
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Related: 56/20-35/20 28/20-70/20 28/40-35/20 28/20-35/40 84/20-35/20 28/60-35/20 28/20-35/60
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