Solutions by everydaycalculation.com
515 - 1415 is -35.
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Related: 10/15-14/15 5/15-28/15 5/30-14/15 5/15-14/30 5/15-42/15 5/45-14/15 5/15-14/45 25/15-14/15 5/15-70/15 5/75-14/15 5/15-14/75 35/15-14/15 5/15-98/15
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