Solutions by everydaycalculation.com
520 - 25 is -320.
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Related: 10/20-2/5 5/20-4/5 5/40-2/5 5/20-2/10 15/20-2/5 5/20-6/5 5/60-2/5 5/20-2/15 25/20-2/5 5/20-10/5 5/20-2/25 35/20-2/5 5/20-14/5 5/20-2/35
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