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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(109.63/x) = 0.25 // - 0.25
1-(109.63/x)-0.25 = 0
1-109.63*x^-1-0.25 = 0
-109.63*x^-1 = -0.75 // : -109.63
x^-1 = 0.00684119
-1 < 0
1/(x^1) = 0.00684119 // * x^1
1 = 0.00684119*x^1 // : 0.00684119
146.17339966 = x^1
x = 146.17339966
x = 146.17339966
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