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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = (6*9)/x // - (6*9)/x
4-((6*9)/x) = 0
4-54*x^-1 = 0
-54*x^-1 = -4 // : -54
x^-1 = 2/27
-1 < 0
1/(x^1) = 2/27 // * x^1
1 = 2/27*x^1 // : 2/27
27/2 = x^1
x = 27/2
x = 27/2
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