Solutions by everydaycalculation.com
1421 - 67 is -421.
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Related: 28/21-6/7 14/21-12/7 14/42-6/7 14/21-6/14 42/21-6/7 14/21-18/7 14/63-6/7 14/21-6/21 70/21-6/7 14/21-30/7 14/21-6/35 98/21-6/7 14/21-42/7 14/21-6/49
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