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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/6 = 13.5/x // - 13.5/x
9/6-(13.5/x) = 0
9/6-13.5*x^-1 = 0
-13.5*x^-1 = -3/2 // : -13.5
x^-1 = 0.11111111
-1 < 0
1/(x^1) = 0.11111111 // * x^1
1 = 0.11111111*x^1 // : 0.11111111
9.00000009 = x^1
x = 9.00000009
x = 9.00000009
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