Solutions by everydaycalculation.com
1st number: 18/20, 2nd number: 2 11/12
1820 - 3512 is -12160.
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Related: 36/20-35/12 18/20-70/12 18/40-35/12 18/20-35/24 54/20-35/12 18/60-35/12 18/20-35/36 90/20-35/12 18/20-35/60 18/20-35/84
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