Solutions by everydaycalculation.com
1030 - 2430 is -715.
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Related: 20/30-24/30 10/30-48/30 10/60-24/30 10/30-24/60 10/30-72/30 10/90-24/30 10/30-24/90 50/30-24/30 70/30-24/30
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