Answer:
x=16.10°
Step-by-step explanation:
You can go through a bunch of equations, but basically the cabinet can be moved until the CG is past the vertical line of the rotation point. After the CG crosses the line the weight of the cabinet will keep the rotation going in the direction.
to Find the angle from one corner to the CG
angle =atan(52/15) = 73.90
So, to make that angle vertical...
90° = x + 73.90°
x=16.10°