Explicación paso a paso:
4+5-[-7+9-(4-2+1)-2]-3+1
4+5-(-7+9-3-2)-3+1
9-(-3)-3+1
9+3-3+1
12-3+1
9+1
10
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Explicación paso a paso:
4+5-[-7+9-(4-2+1)-2]-3+1
4+5-(-7+9-3-2)-3+1
9-(-3)-3+1
9+3-3+1
12-3+1
9+1
10