Solutions by everydaycalculation.com
2130 - 1230 is 310.
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Related: 42/30-12/30 21/30-24/30 21/60-12/30 21/30-12/60 63/30-12/30 21/30-36/30 21/90-12/30 21/30-12/90 21/30-60/30 21/30-84/30
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