Answer:
x = 25
Step-by-step explanation:
From the picture attached,
ΔABC and ΔADE are the similar triangles.
Therefore, their corresponding sides will be in the same ratio.


And AB = AD + DB
= 2(AD) [Since, AD = DB]
By substituting these values,

2 = 
x - 8 = 
x - 8 = 17
x = 17 + 8
x = 25