I think it may be: 0.66666666666
I only looked it up on the internet.
Answer:
x = 8
Step-by-step explanation:
In order for the triangles to be similar, corresponding side must be in proportion.
So, FE/ZY = FD/ZX
6/12 = (2x - 5)/22
6(22) = 12(2x - 5)
132 = 24x - 60
24x = 192