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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3746065934 = 9/x // - 9/x
0.3746065934-(9/x) = 0
0.3746065934-9*x^-1 = 0
-9*x^-1 = -0.3746065934 // : -9
x^-1 = 0.04162295
-1 < 0
1/(x^1) = 0.04162295 // * x^1
1 = 0.04162295*x^1 // : 0.04162295
24.02520725 = x^1
x = 24.02520725
x = 24.02520725
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