11-7=, 4, 9 - 2 =, 7, 6-5=, 10-9, 1, 8 + 6 =, 14, 15 - 7 =, 8, 2 + 9 =, 11, 14 - 5 =, 9, 7 + 3 =, 10, 10 - 4 =, 6

Problem solving Mathematically

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