Respuesta:
r = -8
Explicación paso a paso:
r - 2 + 9 = 4 - 5
r + 7 = -1
r = -1 - 7
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Respuesta:
r = -8
Explicación paso a paso:
r - 2 + 9 = 4 - 5
r + 7 = -1
r = -1 - 7
r = -8