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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(72.91/x) = 0.25 // - 0.25
1-(72.91/x)-0.25 = 0
1-72.91*x^-1-0.25 = 0
-72.91*x^-1 = -0.75 // : -72.91
x^-1 = 0.01028665
-1 < 0
1/(x^1) = 0.01028665 // * x^1
1 = 0.01028665*x^1 // : 0.01028665
97.21337851 = x^1
x = 97.21337851
x = 97.21337851
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