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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.5/13.5 = 13.5/x // - 13.5/x
8.5/13.5-(13.5/x) = 0
8.5/13.5-13.5*x^-1 = 0
-13.5*x^-1 = -0.62962963 // : -13.5
x^-1 = 0.04663923
-1 < 0
1/(x^1) = 0.04663923 // * x^1
1 = 0.04663923*x^1 // : 0.04663923
21.44117731 = x^1
x = 21.44117731
x = 21.44117731
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