Find the missing length?

you have to prove that they are similar triangles .

then you will find that x=7*3=21 because

AB/DE=1/3

im sorry i cant explain and and answering late

|x| + 1 < 2

minus one on both sides

|x| < 1

This represents a closed circle around one going positive one going left. However based on the images choose the one with colored in circles going outwards from the -1 and 1.

Hope this helps! If you think I'm worthy, Brainliest would be great! :D