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a) +(+5)-(+8)= 5-8 =-3
b) -(+7)+(-6)=-7-6 = -13
c) +(-10)-(-4)=-10+4 = -6
d) -(-9)-(+1)= +9 -1 = +8
saludos
B) -7-6= 13 positivo
c)-10+4= -6 negativo
D) 9-1= 8 positivo