Solutions by everydaycalculation.com
742 - 1242 is -542.
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Related: 14/42-12/42 7/42-24/42 7/84-12/42 7/42-12/84 21/42-12/42 7/42-36/42 35/42-12/42 7/42-60/42 49/42-12/42 7/42-84/42
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