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12+3 = 4 +15= 17 – 3 = 8 +2 = 14+3 =
19 – 5 = 13+ 5 = 2+12 = 19 – 7 = 20 – 10 =
3
7
10
15
20
12
8
3 +=15 – 3=13 18 –=15
+4=16 16 –=14 6 +=17
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