I have easily found the X in that internet puzzle using CAD.
IIRC, it is 8+ inches. However, I have not found any shortcut that makes doing that calculation without CAD possible. I look at it from time to time but I have not looked at the video for the answer.
OK, making the assumption that the missing X dimension really is on the drawing, just out of the part that was posted, and looking at the geometry of the pattern I started to draw the pattern with my CAD. I started at what is the 0,0 coordinate at the upper right and drew the (90°?) arc that is closest to that starting point. Then I wanted to draw the horizontal line from the arc's upper-left corner. But I only have that starting point. There is no way to locate the end point of that line. It meets another arc with a 27 (mm?) radius but the two are not drawn as tangent and the center of that 27 mm arc is not shown in any obvious way. The radius line simply terminates at the outline of the part. It is difficult to see if there is a center indicated at that edge, but even if there is, you still need the missing X dimension to that part edge and it is NOT shown on the part of the drawing that is in the image the OP provided.
So, I repeat my statement that "If any of you guys who keep saying that all that is needed is on this image can actually tell the X location of anything, please say so." ALL the information that is needed to just work out the pattern is NOT shown in the photo posted. I need that missing X number to draw just the second element of the pattern. Who knows what else may be missing. So, my CAD drawing of the pattern had to stop after just ONE element.
I think the OP did not spend much time looking at the drawing because if he had, he would have realized that the missing X number is of vital importance. So he did not ensure that it was in the photo of the drawing.
Another problem exists at the right end of the arc at the bottom which is apparently centered at -45, -80. Again, the photo cuts off a vital piece of information, it's radius. And, even with that radius, the right end of that arc is not well located. One could assume that it is at the same, -50 Y coordinate as it's left end is, but that would only be an assumption. A 74.482 mm(?) dimension at a -35° angle is shown and I guess, with some trigonometry, the X-Y coordinates of that point could be found. This is really a poor way to dimension this.