Solutions by everydaycalculation.com
742 - 942 is -121.
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Related: 14/42-9/42 7/42-18/42 7/84-9/42 7/42-9/84 21/42-9/42 7/42-27/42 35/42-9/42 7/42-45/42 49/42-9/42 7/42-63/42
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