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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/3 = 2000/x // - 2000/x
5/3-(2000/x) = 0
5/3-2000*x^-1 = 0
-2000*x^-1 = -5/3 // : -2000
x^-1 = 1/1200
-1 < 0
1/(x^1) = 1/1200 // * x^1
1 = 1/1200*x^1 // : 1/1200
1200 = x^1
x = 1200
x = 1200
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