Solutions by everydaycalculation.com
1st number: 18/30, 2nd number: 2 21/30
1830 - 8130 is -2110.
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Related: 36/30-81/30 18/60-81/30 18/30-81/60 54/30-81/30 18/90-81/30 18/30-81/90 90/30-81/30
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