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Verified answer
Respuesta:a) (+9)-(-2)
9+2= 11
hacia la derecha.
+9 - - - - >
c)(-12) - (+4)
-12 - 4= - 16 hacia la izq
<-------------- - 12
b) +20) -(+15)
20 - 15= 5
hacia la izquierda.
<---------------20
d) (-1)-(-8)
-1 +8= 7
Hacia la derecha.
-1------------>
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