Respuesta :

Answer:

12

Step-by-step explanation:

x = 2n

2n + 2n + 2 + 2n + 4 + 2n + 6 + 2n + 8 = 80

10n = 60

n = 6

x = 12

12 + 14 + 16 + 18 + 20 = 80

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