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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = -104 // + 104
8/x+104 = 0
8*x^-1 = -104 // : 8
x^-1 = -13
-1 < 0
1/(x^1) = -13 // * x^1
1 = -13*x^1 // : -13
-1/13 = x^1
x = -1/13
x = -1/13
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