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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
44/x = 1.61 // - 1.61
44/x-1.61 = 0
44*x^-1 = 1.61 // : 44
x^-1 = 0.03659091
-1 < 0
1/(x^1) = 0.03659091 // * x^1
1 = 0.03659091*x^1 // : 0.03659091
27.32919187 = x^1
x = 27.32919187
x = 27.32919187
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