Solutions by everydaycalculation.com
1221 - 79 is -1363.
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Related: 24/21-7/9 12/21-14/9 12/42-7/9 12/21-7/18 36/21-7/9 12/21-21/9 12/63-7/9 12/21-7/27 60/21-7/9 12/21-35/9 12/21-7/45 84/21-7/9 12/21-49/9 12/21-7/63
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