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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(23.44/x) = 0.65 // - 0.65
1-(23.44/x)-0.65 = 0
1-23.44*x^-1-0.65 = 0
-23.44*x^-1 = -0.35 // : -23.44
x^-1 = 0.01493174
-1 < 0
1/(x^1) = 0.01493174 // * x^1
1 = 0.01493174*x^1 // : 0.01493174
66.97143133 = x^1
x = 66.97143133
x = 66.97143133
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