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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)/x = 9/15 // - 9/15
(2/3)/x-(9/15) = 0
(2/3)/x-3/5 = 0
2/3*x^-1 = 3/5 // : 2/3
x^-1 = 9/10
-1 < 0
1/(x^1) = 9/10 // * x^1
1 = 9/10*x^1 // : 9/10
10/9 = x^1
x = 10/9
x = 10/9
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