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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 0.44 // - 0.44
8/x-0.44 = 0
8*x^-1 = 0.44 // : 8
x^-1 = 0.055
-1 < 0
1/(x^1) = 0.055 // * x^1
1 = 0.055*x^1 // : 0.055
18.18181818 = x^1
x = 18.18181818
x = 18.18181818
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