Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 4 3/15
1815 - 6315 is -31.
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Related: 36/15-63/15 18/30-63/15 18/15-63/30 54/15-63/15 18/45-63/15 18/15-63/45 90/15-63/15 18/75-63/15 18/15-63/75
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