batman equation in advanced graph app

[Gabriel]

What do you mean? The fact is that I cant get correct even only this part, the green one in your picture:
(x/7)^2*sqrt(||x|-3|/(|x|-3))+(y/3)^2*sqrt(|y-3sqrt33/7|/(y-3sqrt33/7))-1=0
There are vertical and horizontal segments that dont exist!