Answer:
X = 7
AB = 14
BC = 14
CA = 14
Explanation:
This is an equilateral triangle so you can set the lengths equal to each other in order to find X.
2x=x+7
-x -x
x=7
you can do this with any combination of the lengths and you will always get 7
Now you plug in 7 for x
Original: 2x
Plug in 7: 2*7
You get 14
Since this is after all, an equilateral triangle all lengths are equal so all lengths are 14.