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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3 = 9/x // - 9/x
0.3-(9/x) = 0
0.3-9*x^-1 = 0
-9*x^-1 = -0.3 // : -9
x^-1 = 0.03333333
-1 < 0
1/(x^1) = 0.03333333 // * x^1
1 = 0.03333333*x^1 // : 0.03333333
30.000003 = x^1
x = 30.000003
x = 30.000003
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