Solutions by everydaycalculation.com
1642 - 842 is 421.
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Related: 32/42-8/42 16/42-16/42 16/84-8/42 16/42-8/84 48/42-8/42 16/42-24/42 80/42-8/42 16/42-40/42 16/42-56/42
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