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