Solutions by everydaycalculation.com
1st number: 1 10/20, 2nd number: 1 15/20
3020 - 3520 is -14.
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Related: 60/20-35/20 30/20-70/20 30/40-35/20 30/20-35/40 90/20-35/20 30/60-35/20 30/20-35/60
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