Solutions by everydaycalculation.com
1242 - 1642 is -221.
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Related: 24/42-16/42 12/42-32/42 12/84-16/42 12/42-16/84 36/42-16/42 12/42-48/42 60/42-16/42 12/42-80/42 84/42-16/42
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