Solutions by everydaycalculation.com
1021 - 89 is -2663.
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Related: 20/21-8/9 10/21-16/9 10/42-8/9 10/21-8/18 30/21-8/9 10/21-24/9 10/63-8/9 10/21-8/27 50/21-8/9 10/21-40/9 10/21-8/45 70/21-8/9 10/21-56/9 10/21-8/63
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