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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(48.07/x) = 0.73 // - 0.73
1-(48.07/x)-0.73 = 0
1-48.07*x^-1-0.73 = 0
-48.07*x^-1 = -0.27 // : -48.07
x^-1 = 0.00561681
-1 < 0
1/(x^1) = 0.00561681 // * x^1
1 = 0.00561681*x^1 // : 0.00561681
178.03699965 = x^1
x = 178.03699965
x = 178.03699965
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