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7 + 6 = 5 + 9 = 8 + 7 = 5 + 8 =

7 + 9 = 9 + 8 = 5 + 7 = 8 + 4 =

9 + 3 = 9 + 9 = 3 + 8 = 6 + 5 =

7 + 4 = 8 + 8 = 6 + 8 = 2 + 9 =

7 + 7 = 3 + 7 = 6 + 6 = 6 + 9 =

8 + 6 = 3 + 8 = 5 + 5 = 7 + 8 =

12 – 4 = 15 – 6 = 14 – 7 = 11 – 8 =

14 – 9 = 15 – 7 = 　 15 – 9 = 　16 – 7 =

13 – 6 = 16 – 9 = 11 – 5 = 　 12 – 8 =

11 – 7 = 18 – 9 = 17 – 8 = 14 – 8 =

13 – 7 = 15 – 8 = 14 – 5 = 11 – 9 =

17 – 9 = 17 – 9 = 11 – 5 = 13 – 8 =