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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/18 = 8.5/x // - 8.5/x
8/18-(8.5/x) = 0
8/18-8.5*x^-1 = 0
-8.5*x^-1 = -4/9 // : -8.5
x^-1 = 0.05228758
-1 < 0
1/(x^1) = 0.05228758 // * x^1
1 = 0.05228758*x^1 // : 0.05228758
19.12500062 = x^1
x = 19.12500062
x = 19.12500062
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