Solutions by everydaycalculation.com
1st number: 21/30, 2nd number: 1 20/30
2130 - 5030 is -2930.
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Related: 42/30-50/30 21/60-50/30 21/30-50/60 63/30-50/30 21/90-50/30 21/30-50/90
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