Solutions by everydaycalculation.com
16 - 1221 is -1742.
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Related: 2/6-12/21 1/6-24/21 1/12-12/21 1/6-12/42 3/6-12/21 1/6-36/21 1/18-12/21 1/6-12/63 5/6-12/21 1/6-60/21 1/30-12/21 7/6-12/21 1/6-84/21 1/42-12/21
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