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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = -11 // + 11
3/x+11 = 0
3*x^-1 = -11 // : 3
x^-1 = -11/3
-1 < 0
1/(x^1) = -11/3 // * x^1
1 = -11/3*x^1 // : -11/3
-3/11 = x^1
x = -3/11
x = -3/11
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