You can put this solution on YOUR website! Draw a line from Z perpendicular on KJ. This will give you a triangle with one angle of 90 degrees and the other 1.5*(4*x-10).
Using trigonometry, you find that |KJ| divided by 2|KZ|= sin(1.5*(4*x-10))/
This is all I can tell you now since I don't think you gave me the entire question.
