Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 1 3/12
1815 - 1512 is -120.
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Related: 36/15-15/12 18/15-30/12 18/30-15/12 18/15-15/24 54/15-15/12 18/15-45/12 18/45-15/12 18/15-15/36 90/15-15/12 18/15-75/12 18/75-15/12 18/15-15/60 18/15-15/84
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