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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.5/9 = 11.6/x // - 11.6/x
7.5/9-(11.6/x) = 0
7.5/9-11.6*x^-1 = 0
-11.6*x^-1 = -0.83333333 // : -11.6
x^-1 = 0.07183908
-1 < 0
1/(x^1) = 0.07183908 // * x^1
1 = 0.07183908*x^1 // : 0.07183908
13.92000009 = x^1
x = 13.92000009
x = 13.92000009
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