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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 30/23 // - 30/23
8/x-(30/23) = 0
8/x-30/23 = 0
8*x^-1 = 30/23 // : 8
x^-1 = 15/92
-1 < 0
1/(x^1) = 15/92 // * x^1
1 = 15/92*x^1 // : 15/92
92/15 = x^1
x = 92/15
x = 92/15
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