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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
500/x = 3 // - 3
500/x-3 = 0
500*x^-1 = 3 // : 500
x^-1 = 3/500
-1 < 0
1/(x^1) = 3/500 // * x^1
1 = 3/500*x^1 // : 3/500
500/3 = x^1
x = 500/3
x = 500/3
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