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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(35.62/x) = 0.25 // - 0.25
1-(35.62/x)-0.25 = 0
1-35.62*x^-1-0.25 = 0
-35.62*x^-1 = -0.75 // : -35.62
x^-1 = 0.02105559
-1 < 0
1/(x^1) = 0.02105559 // * x^1
1 = 0.02105559*x^1 // : 0.02105559
47.493326 = x^1
x = 47.493326
x = 47.493326
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