Solutions by everydaycalculation.com
1st number: 21/30, 2nd number: 2 4/30
2130 - 6430 is -4330.
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Related: 42/30-64/30 21/60-64/30 21/30-64/60 63/30-64/30 21/90-64/30 21/30-64/90
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