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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.305/x = 11.65 // - 11.65
5.305/x-11.65 = 0
5.305*x^-1 = 11.65 // : 5.305
x^-1 = 2.19604147
-1 < 0
1/(x^1) = 2.19604147 // * x^1
1 = 2.19604147*x^1 // : 2.19604147
0.45536481 = x^1
x = 0.45536481
x = 0.45536481
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