Solution
Given, $$x$$ = 2, $$y$$ = 1, $$z$$ = -3 then
$$x$$ + $$y$$ + $$z$$ = 2 + 1 - 3 = 0
When $$x$$ + $$y$$ + $$z$$ = 0 then $$x^3+y^3+z^3=3xyz$$
Therefore $$x^3+y^3+z^3-3xyz=0$$
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