Respuesta :

Answer:

x = 16

Step-by-step explanation:

m∠EBA = m∠CBF = 40 - x

m∠DBE + m∠EBA = 90°

so (6x - 30) + (40 - x) = 90

6x - 30 + 40 - x = 90

5x + 10 = 90

5x = 90 - 10 = 80

so

x = 80/5 = 16

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