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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20.43/x = 5.84 // - 5.84
20.43/x-5.84 = 0
20.43*x^-1 = 5.84 // : 20.43
x^-1 = 0.28585414
-1 < 0
1/(x^1) = 0.28585414 // * x^1
1 = 0.28585414*x^1 // : 0.28585414
3.49828762 = x^1
x = 3.49828762
x = 3.49828762
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