Aquí te dejo mi respuesta:
7 - 4 + {-1 + 2 - [- (6 - 4 + 2) + (5 - 3 - 1)] - 3}
7 - 4 + {-1 + 2 - [- (4) + (1)] - 3}
7 - 4 + {-1 + 2 - [-4 + 1] - 3}
7 - 4 + {-1 + 2 - [-3] - 3}
7 - 4 + {-1 + 2 - -3 - 3}
7 - 4 + {-1 + 2 + 3 - 3}
7 - 4 + {1}
7 - 4 + 1
3 + 1
4
Espero haberte ayudado :D
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Aquí te dejo mi respuesta:
7 - 4 + {-1 + 2 - [- (6 - 4 + 2) + (5 - 3 - 1)] - 3}
7 - 4 + {-1 + 2 - [- (4) + (1)] - 3}
7 - 4 + {-1 + 2 - [-4 + 1] - 3}
7 - 4 + {-1 + 2 - [-3] - 3}
7 - 4 + {-1 + 2 - -3 - 3}
7 - 4 + {-1 + 2 + 3 - 3}
7 - 4 + {1}
7 - 4 + 1
3 + 1
4
Espero haberte ayudado :D