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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x+2 = 130 // - 130
11/x-130+2 = 0
11*x^-1 = 128 // : 11
x^-1 = 128/11
-1 < 0
1/(x^1) = 128/11 // * x^1
1 = 128/11*x^1 // : 128/11
11/128 = x^1
x = 11/128
x = 11/128
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