Help with Python task?

Hey, I'm stuck on this Python problem. The part where the problem lies is comparing the mouse coordinate and the turtle's coordinate. I tried doing it with an if statement, which then goes to a random position if the difference between the mouse's x-coordinate and the turtle's x-coordinate is between -10 and 10. Nothing happens.

So it means this:

if x – pos()[0] in range(-10,11):

goto…