Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 1 20/30
1230 - 5030 is -1915.
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Related: 24/30-50/30 12/60-50/30 12/30-50/60 36/30-50/30 12/90-50/30 12/30-50/90 60/30-50/30 84/30-50/30
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