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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 1.33333333 // - 1.33333333
9/x-1.33333333 = 0
9*x^-1 = 1.33333333 // : 9
x^-1 = 0.14814815
-1 < 0
1/(x^1) = 0.14814815 // * x^1
1 = 0.14814815*x^1 // : 0.14814815
6.74999992 = x^1
x = 6.74999992
x = 6.74999992
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