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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 11.3 // - 11.3
5/x-11.3 = 0
5*x^-1 = 11.3 // : 5
x^-1 = 2.26
-1 < 0
1/(x^1) = 2.26 // * x^1
1 = 2.26*x^1 // : 2.26
0.44247788 = x^1
x = 0.44247788
x = 0.44247788
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