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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+1/11 = 6/x // - 6/x
2/x-(6/x)+1/11 = 0
2/x-6*x^-1+1/11 = 0
-4*x^-1 = -1/11 // : -4
x^-1 = 1/44
-1 < 0
1/(x^1) = 1/44 // * x^1
1 = 1/44*x^1 // : 1/44
44 = x^1
x = 44
x = 44
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