All you need is in the photo

If you put random answer you are gonna lise points

x=6

Step-by-step explanation:

This is a similar triangle.

there's a relationship between the length of 15 and 6;

15/6=2.5. Meaning that the big triangle's length is 2.5 greater than that of the second triangle.

Therefore, we can now plug in (14+x)=(14-x)(2.5)

14+x=35-2.5x

subtract x from both sides

14=35-3.5x

subtract 35 from both sides

-21=-2.5x

x=6