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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(107.54/x) = 0.25 // - 0.25
1-(107.54/x)-0.25 = 0
1-107.54*x^-1-0.25 = 0
-107.54*x^-1 = -0.75 // : -107.54
x^-1 = 0.00697415
-1 < 0
1/(x^1) = 0.00697415 // * x^1
1 = 0.00697415*x^1 // : 0.00697415
143.38664927 = x^1
x = 143.38664927
x = 143.38664927
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