Respuesta:
n (n-3) / 2 + n + n = 9n
n (n-3) / 2 = 7n
n (n-3) = 14n
n = 17
la respuesta es 17
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Respuesta:
n (n-3) / 2 + n + n = 9n
n (n-3) / 2 = 7n
n (n-3) = 14n
n = 17
la respuesta es 17