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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.5 = (4.93/x)/((5-4.93)/100) // - (4.93/x)/((5-4.93)/100)
7.5-((4.93/x)/((5-4.93)/100)) = 0
7.5-493*(5-4.93)^-1*x^-1 = 0
-493*0.07^-1*x^-1 = -7.5 // : -493*0.07^-1
x^-1 = 0.0010649086
-1 < 0
1/(x^1) = 0.0010649086 // * x^1
1 = 0.0010649086*x^1 // : 0.0010649086
939.04772673 = x^1
x = 939.04772673
x = 939.04772673
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