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- 6 + {7 - 4 - [ - 2 + 3 - (1 + 5 - 8)]} - 9
- 6 + { 3 - [ + 1 - (- 2)]} - 9
- 6 + [3 - [1 + 2]} - 9
- 6 + [3 - 3 ]} - 9
- 6 - 9
- 15
primero paréntesis luego corchetes y ya