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20+9-2+15-3
29-2+15-3
27+15-3
42-3
39
Resolvemos:
5 x 4 + 9 - 2 + 15 - 3
20 + 9 - 2 + 15 - 3
29 - 2 + 15 - 3
27 + 15 - 3
42 - 3
39
Respuesta: 39