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12 - 7 = 14 - 5 = 4 + 9 = 9 + 8 = 15 - 5 =
18 - 9 = 59 - 9 = 50 + 8 = 10 + 40 = 45 - 5 =
30 + 5 = 75 - 30 = 57 - 40 = 10 + 9 = 20 + 5 =
5+60= 19-9+3= 39-9+8= 15-8+2= 11-9+4=
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