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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
n/x = 500 // - 500
n/x-500 = 0
n*x^-1 = 500 // : n
x^-1 = 500/n
-1 < 0
1/(x^1) = 500/n // * x^1
1 = (500/n)*x^1 // : 500/n
1/(500/n) = x^1
x = 1/(500/n)
x = 1/(500/n)
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