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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/11 = 4/x-1 // - 4/x-1
2/11-(4/x)+1 = 0
2/11-4*x^-1+1 = 0
-4*x^-1 = -13/11 // : -4
x^-1 = 13/44
-1 < 0
1/(x^1) = 13/44 // * x^1
1 = 13/44*x^1 // : 13/44
44/13 = x^1
x = 44/13
x = 44/13
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