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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000/x = 2.1 // - 2.1
1000/x-2.1 = 0
1000*x^-1 = 2.1 // : 1000
x^-1 = 0.0021
-1 < 0
1/(x^1) = 0.0021 // * x^1
1 = 0.0021*x^1 // : 0.0021
476.19047619 = x^1
x = 476.19047619
x = 476.19047619
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