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7+[-4-(-2-3)+5]-1
7+[-4+2+3+5]-1
7-4+2+3+5-1=12
2) ir resolviendo los paréntesis y corchetes:
7+[-4-(-2-3)+5]-1
7+[-4-(-5)+5]-1
7+[-4+5+5]-1
7+6-1=12