Solutions by everydaycalculation.com
921 - 79 is -2263.
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Related: 18/21-7/9 9/21-14/9 9/42-7/9 9/21-7/18 27/21-7/9 9/21-21/9 9/63-7/9 9/21-7/27 45/21-7/9 9/21-35/9 9/21-7/45 63/21-7/9 9/21-49/9 9/21-7/63
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