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b) (11) - (-2) + (-16)
=11 + 2 - 16
= -3
+8 -10 +16 +21 -12 = -22 +45 = ´ Respuesta +23
(5+8-2)-(2+3-7)+(-9-2-5)=
(+10)-(-2)+(-16)
-10 +2 -16 = -26 +2 = Respuesta -24