Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 2 21/30
1230 - 8130 is -2310.
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Related: 24/30-81/30 12/60-81/30 12/30-81/60 36/30-81/30 12/90-81/30 12/30-81/90 60/30-81/30 84/30-81/30
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