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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16.4 = 71.1/x // - 71.1/x
16.4-(71.1/x) = 0
16.4-71.1*x^-1 = 0
-71.1*x^-1 = -16.4 // : -71.1
x^-1 = 0.23066104
-1 < 0
1/(x^1) = 0.23066104 // * x^1
1 = 0.23066104*x^1 // : 0.23066104
4.33536587 = x^1
x = 4.33536587
x = 4.33536587
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