I need help with this

Answer:
Step-by-step explanation:
Take what's given and write an equation. If you know that the distance to the mid point is half of the entire length, you can say
2(x+6) = 9x -2
Distribute to get 2x + 12 = 9x -2
Solve 12 +2 = 9x -2
7x = 14. So x=2
Substitute 2 for x in the original equation.
2(2+6) = 9(2) - 2
16 = 16
So the length of UW is 16