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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/5 = 2000/x // - 2000/x
2/5-(2000/x) = 0
2/5-2000*x^-1 = 0
-2000*x^-1 = -2/5 // : -2000
x^-1 = 1/5000
-1 < 0
1/(x^1) = 1/5000 // * x^1
1 = 1/5000*x^1 // : 1/5000
5000 = x^1
x = 5000
x = 5000
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