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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-5/x = 2/(-4.4) // - 2/(-4.4)
-5/x-(2/(-4.4)) = 0
0.45454545-5/x = 0
-5*x^-1 = -0.45454545 // : -5
x^-1 = 0.09090909
-1 < 0
1/(x^1) = 0.09090909 // * x^1
1 = 0.09090909*x^1 // : 0.09090909
11.00000011 = x^1
x = 11.00000011
x = 11.00000011
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