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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/5)/x = 2/0.8 // - 2/0.8
(2/5)/x-(2/0.8) = 0
(2/5)/x-2.5 = 0
2/5*x^-1 = 2.5 // : 2/5
x^-1 = 6.25
-1 < 0
1/(x^1) = 6.25 // * x^1
1 = 6.25*x^1 // : 6.25
0.16 = x^1
x = 0.16
x = 0.16
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