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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(12.41/x) = 0.25 // - 0.25
1-(12.41/x)-0.25 = 0
1-12.41*x^-1-0.25 = 0
-12.41*x^-1 = -0.75 // : -12.41
x^-1 = 0.06043513
-1 < 0
1/(x^1) = 0.06043513 // * x^1
1 = 0.06043513*x^1 // : 0.06043513
16.54666748 = x^1
x = 16.54666748
x = 16.54666748
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