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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.8 = 5.8/x // - 5.8/x
0.8-(5.8/x) = 0
0.8-5.8*x^-1 = 0
-5.8*x^-1 = -0.8 // : -5.8
x^-1 = 0.13793103
-1 < 0
1/(x^1) = 0.13793103 // * x^1
1 = 0.13793103*x^1 // : 0.13793103
7.25000024 = x^1
x = 7.25000024
x = 7.25000024
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