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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/23 = 34/x // - 34/x
12/23-(34/x) = 0
12/23-34*x^-1 = 0
-34*x^-1 = -12/23 // : -34
x^-1 = 6/391
-1 < 0
1/(x^1) = 6/391 // * x^1
1 = 6/391*x^1 // : 6/391
391/6 = x^1
x = 391/6
x = 391/6
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