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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 4/18 // - 4/18
6/x-(4/18) = 0
6/x-2/9 = 0
6*x^-1 = 2/9 // : 6
x^-1 = 1/27
-1 < 0
1/(x^1) = 1/27 // * x^1
1 = 1/27*x^1 // : 1/27
27 = x^1
x = 27
x = 27
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