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**What is the meaning of this: {x,0,0}/|x|^3 = (20^7, 50^6) ??**

When I plug in this "{x,0,0}/|x|^3", here: http://www.wolframalpha.com/

...it plots some range for x=-1 to x=+1, and it plots values from 5*10^6 to 2*10^7.

What does that mean and where did those numbers come from? What is it that I wrote, what kind of function is that? What is the meaning of the result? What did Mathematica do? What is the actual calculation behind this, how can I obtain those numbers with pen and paper, what are the steps?