Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 1 6/12
1815 - 1812 is -310.
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Related: 36/15-18/12 18/15-36/12 18/30-18/12 18/15-18/24 54/15-18/12 18/15-54/12 18/45-18/12 18/15-18/36 90/15-18/12 18/15-90/12 18/75-18/12 18/15-18/60 18/15-18/84
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