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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/5)/x = 2/0.9 // - 2/0.9
(2/5)/x-(2/0.9) = 0
(2/5)/x-2.22222222 = 0
2/5*x^-1 = 2.22222222 // : 2/5
x^-1 = 5.55555555
-1 < 0
1/(x^1) = 5.55555555 // * x^1
1 = 5.55555555*x^1 // : 5.55555555
0.18 = x^1
x = 0.18
x = 0.18
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