En total hay 23 soluciones distintas:
1: -1 – 2 – 3 – 4 – 5 + 6 – 7 + 8 + 9
2: -1 – 2 – 3 + 4 + 5 + 6 – 7 + 8 – 9
3: -1 – 2 + 3 – 4 + 5 – 6 + 7 + 8 – 9
4: -1 – 2 + 3 – 4 + 5 + 6 – 7 – 8 + 9
5: -1 – 2 + 3 + 4 – 5 – 6 + 7 – 8 + 9
6: -1 + 2 – 3 – 4 – 5 + 6 + 7 + 8 – 9
7: -1 + 2 – 3 – 4 + 5 – 6 + 7 – 8 + 9
8: -1 + 2 – 3 + 4 – 5 – 6 – 7 + 8 + 9
9: -1 + 2 + 3 – 4 + 5 + 6 + 7 – 8 – 9
10: -1 + 2 + 3 + 4 – 5 + 6 – 7 + 8 – 9
11: -1 + 2 + 3 + 4 + 5 – 6 – 7 – 8 + 9
12: 1 – 2 – 3 – 4 – 5 + 6 + 7 – 8 + 9
13: 1 – 2 – 3 – 4 + 5 – 6 – 7 + 8 + 9
14: 1 – 2 – 3 + 4 + 5 + 6 + 7 – 8 – 9
15: 1 – 2 + 3 – 4 + 5 + 6 – 7 + 8 – 9
16: 1 – 2 + 3 + 4 – 5 – 6 + 7 + 8 – 9
17: 1 – 2 + 3 + 4 – 5 + 6 – 7 – 8 + 9
18: 1 + 2 – 3 – 4 + 5 – 6 + 7 + 8 – 9
19: 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9
20: 1 + 2 – 3 + 4 – 5 – 6 + 7 – 8 + 9
21: 1 + 2 + 3 – 4 – 5 – 6 – 7 + 8 + 9
22: 1 + 2 + 3 + 4 – 5 + 6 + 7 – 8 – 9
23: 1 + 2 + 3 + 4 + 5 – 6 – 7 + 8 – 9
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