Solutions by everydaycalculation.com
421 - 312 is -584.
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Related: 8/21-3/12 4/21-6/12 4/42-3/12 4/21-3/24 12/21-3/12 4/21-9/12 4/63-3/12 4/21-3/36 20/21-3/12 4/21-15/12 4/21-3/60 28/21-3/12 4/21-21/12 4/21-3/84
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