Solutions by everydaycalculation.com
1215 - 89 is -445.
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Related: 24/15-8/9 12/15-16/9 12/30-8/9 12/15-8/18 36/15-8/9 12/15-24/9 12/45-8/9 12/15-8/27 60/15-8/9 12/15-40/9 12/75-8/9 12/15-8/45 84/15-8/9 12/15-56/9 12/15-8/63
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