Explicación paso a paso:
(+9)+(-5) = +4
(+6) - (-8) = +20
-7 -2 = -9
-13 + 17 = +14
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Explicación paso a paso:
(+9)+(-5) = +4
(+6) - (-8) = +20
-7 -2 = -9
-13 + 17 = +14