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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/3.65 = 8/x // - 8/x
5/3.65-(8/x) = 0
5/3.65-8*x^-1 = 0
-8*x^-1 = -1.36986301 // : -8
x^-1 = 0.17123288
-1 < 0
1/(x^1) = 0.17123288 // * x^1
1 = 0.17123288*x^1 // : 0.17123288
5.83999989 = x^1
x = 5.83999989
x = 5.83999989
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