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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/94 = 5.5/x // - 5.5/x
8/94-(5.5/x) = 0
8/94-5.5*x^-1 = 0
-5.5*x^-1 = -4/47 // : -5.5
x^-1 = 0.01547389
-1 < 0
1/(x^1) = 0.01547389 // * x^1
1 = 0.01547389*x^1 // : 0.01547389
64.62499087 = x^1
x = 64.62499087
x = 64.62499087
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