Solutions by everydaycalculation.com
1st number: 18/20, 2nd number: 1 15/20
1820 - 3520 is -1720.
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Related: 36/20-35/20 18/20-70/20 18/40-35/20 18/20-35/40 54/20-35/20 18/60-35/20 18/20-35/60 90/20-35/20
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