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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/5)/x = 8/15 // - 8/15
(2/5)/x-(8/15) = 0
(2/5)/x-8/15 = 0
2/5*x^-1 = 8/15 // : 2/5
x^-1 = 4/3
-1 < 0
1/(x^1) = 4/3 // * x^1
1 = 4/3*x^1 // : 4/3
3/4 = x^1
x = 3/4
x = 3/4
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