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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
44.7/x = 0.97 // - 0.97
44.7/x-0.97 = 0
44.7*x^-1 = 0.97 // : 44.7
x^-1 = 0.02170022
-1 < 0
1/(x^1) = 0.02170022 // * x^1
1 = 0.02170022*x^1 // : 0.02170022
46.08248211 = x^1
x = 46.08248211
x = 46.08248211
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