Question: Why doesn't implicitplot3d work?

with(plots);

implicitplot3d((x+y+z)^2=0, x=-100..100,y=-100..100,z=-100..100)

can be plot, and only show me an empty box.

and i get the same empty box when i reduce the interval.

for example :

implicitplot3d((x+y+z)^2=0, x=-5..5,y=-5..5,z=-5..5)

and

implicitplot3d((x+y+z)^2=0, x=-0.1..0.1,y=-0.1..0.1,z=-0.1..0.1)

please help me.

thanks for reading this question, and i hope i get an answer.

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