Respuesta :

Answer:

7

Step-by-step explanation:

CAEDALPE

E + F + G = 180°

112 + (13x-7) + 4x = 180

112 + 13x - 7 +4x =180

17x + 105 = 180

17x = 180 - 105

17x = 75

x = 75/17

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