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RS -- Adding/Subtracting double digit

AB
25 + 43 =68
71 + 26 =97
54 + 32 =86
30 + 18 =48
53 + 46 =99
47 + 22 =69
68 + 10 =78
32 + 51 =83
83 + 13 =96
18 + 31 =49
38 - 19 =19
24 - 17 =7
33 - 21 =12
55 - 32 =23
21 - 17 =4
66 - 26 =40
77 - 22 =55
22 - 11 =11
16 - 6 =10
39 - 18 =21



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