Solutions by everydaycalculation.com
1242 - 712 is -2584.
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Related: 24/42-7/12 12/42-14/12 12/84-7/12 12/42-7/24 36/42-7/12 12/42-21/12 12/42-7/36 60/42-7/12 12/42-35/12 12/42-7/60 84/42-7/12 12/42-49/12 12/42-7/84
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