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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2000*x)/x-(2000/x)-10 = 100 // - 100
(2000*x)/x-(2000/x)-100-10 = 0
(2000*x)/x-2000*x^-1-100-10 = 0
-2000*x^-1 = -1890 // : -2000
x^-1 = 189/200
-1 < 0
1/(x^1) = 189/200 // * x^1
1 = 189/200*x^1 // : 189/200
200/189 = x^1
x = 200/189
x = 200/189
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