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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/2)/x = 2/0.4 // - 2/0.4
(1/2)/x-(2/0.4) = 0
(1/2)/x-5 = 0
1/2*x^-1 = 5 // : 1/2
x^-1 = 10
-1 < 0
1/(x^1) = 10 // * x^1
1 = 10*x^1 // : 10
1/10 = x^1
x = 1/10
x = 1/10
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