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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000/560000 = 2001/x // - 2001/x
1000/560000-(2001/x) = 0
1000/560000-2001*x^-1 = 0
-2001*x^-1 = -1/560 // : -2001
x^-1 = 1/1120560
-1 < 0
1/(x^1) = 1/1120560 // * x^1
1 = 1/1120560*x^1 // : 1/1120560
1120560 = x^1
x = 1120560
x = 1120560
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