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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/5)/x = 2/0.6 // - 2/0.6
(2/5)/x-(2/0.6) = 0
(2/5)/x-3.33333333 = 0
2/5*x^-1 = 3.33333333 // : 2/5
x^-1 = 8.33333333
-1 < 0
1/(x^1) = 8.33333333 // * x^1
1 = 8.33333333*x^1 // : 8.33333333
0.12 = x^1
x = 0.12
x = 0.12
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