3+2-(-5+1)
5-(-4)
5+4
9// positivo
______________________
3+2+5+1
5+6
11// positivo
__________________________
10-9
1// negativo
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3+2-(-5+1)
5-(-4)
5+4
9// positivo
______________________
3+2+5+1
5+6
11// positivo
__________________________
10-9
1// negativo
____________________________