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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/9)/x = 12 // - 12
(4/9)/x-12 = 0
4/9*x^-1 = 12 // : 4/9
x^-1 = 27
-1 < 0
1/(x^1) = 27 // * x^1
1 = 27*x^1 // : 27
1/27 = x^1
x = 1/27
x = 1/27
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