Solutions by everydaycalculation.com
13 - 915 is -415.
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Related: 2/3-9/15 1/3-18/15 1/6-9/15 1/3-9/30 1/3-27/15 1/9-9/15 1/3-9/45 5/3-9/15 1/3-45/15 1/15-9/15 1/3-9/75 7/3-9/15 1/3-63/15 1/21-9/15
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