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(-)(-)= +
(+)(+)=+
(-)(+)=-
-3*5*-6= -90
-4*7= -28
-4*7= -28
6*-1*0=0
AHora resuelve lo ultimo tu
(-90)-(-28)+(-28)+(0) recuerda aplicar ley de signos.
90+28-28+0=90