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15 + 5 = ______
12 - 7 = ______
9 + 8 = ______
18 - 9 = ______
7 + 6 = ______
10 + 10 = ______
14 - 6 = ______
5 + 9 = ______
11 - 4 = ______
8 + 7 = ______