Solutions by everydaycalculation.com
921 - 56 is -1742.
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Related: 18/21-5/6 9/21-10/6 9/42-5/6 9/21-5/12 27/21-5/6 9/21-15/6 9/63-5/6 9/21-5/18 45/21-5/6 9/21-25/6 9/21-5/30 63/21-5/6 9/21-35/6 9/21-5/42
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