Solutions by everydaycalculation.com
1st number: 1 15/20, 2nd number: 1 8/10
3520 - 1810 is -120.
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Related: 70/20-18/10 35/20-36/10 35/40-18/10 35/20-18/20 35/20-54/10 35/60-18/10 35/20-18/30 35/20-90/10 35/20-18/50 35/20-18/70
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