Solutions by everydaycalculation.com
815 - 35 is -115.
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Related: 16/15-3/5 8/15-6/5 8/30-3/5 8/15-3/10 24/15-3/5 8/15-9/5 8/45-3/5 8/15-3/15 40/15-3/5 8/15-15/5 8/75-3/5 8/15-3/25 56/15-3/5 8/15-21/5 8/15-3/35
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