Solutions by everydaycalculation.com
13 - 1215 is -715.
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Related: 2/3-12/15 1/3-24/15 1/6-12/15 1/3-12/30 1/3-36/15 1/9-12/15 1/3-12/45 5/3-12/15 1/3-60/15 1/15-12/15 1/3-12/75 7/3-12/15 1/3-84/15 1/21-12/15
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