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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 0.19 // - 0.19
4/x-0.19 = 0
4*x^-1 = 0.19 // : 4
x^-1 = 0.0475
-1 < 0
1/(x^1) = 0.0475 // * x^1
1 = 0.0475*x^1 // : 0.0475
21.05263158 = x^1
x = 21.05263158
x = 21.05263158
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