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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
99/23 = 25.5/x // - 25.5/x
99/23-(25.5/x) = 0
99/23-25.5*x^-1 = 0
-25.5*x^-1 = -99/23 // : -25.5
x^-1 = 0.16879795
-1 < 0
1/(x^1) = 0.16879795 // * x^1
1 = 0.16879795*x^1 // : 0.16879795
5.92424256 = x^1
x = 5.92424256
x = 5.92424256
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