Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 1 8/10
1815 - 1810 is -35.
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Related: 36/15-18/10 18/15-36/10 18/30-18/10 18/15-18/20 54/15-18/10 18/15-54/10 18/45-18/10 18/15-18/30 90/15-18/10 18/15-90/10 18/75-18/10 18/15-18/50 18/15-18/70
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