Solutions by everydaycalculation.com
221 - 312 is -1384.
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Related: 4/21-3/12 2/21-6/12 2/42-3/12 2/21-3/24 6/21-3/12 2/21-9/12 2/63-3/12 2/21-3/36 10/21-3/12 2/21-15/12 2/21-3/60 14/21-3/12 2/21-21/12 2/21-3/84
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