Answer:
x = 2
Step-by-step explanation:
This triangle isosceles because of it's two marked congruent sides.
Using base angle theorem, reflexive property (the line in the middle is congruent to itself), and given, we can prove that the two triangles are congruent.
Now that we have proved triangle congruency (SAS), we know that:
17x-3 = 9x+13
Plus 3 on both sides and minus 9x on both sides
8x = 16
Divide by 8 on both sides to isolate x
x = 2
Hope this helps :)
Have a nice day!