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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-1 = -36/x-8 // + -36/x-8
6/x-(-36/x)-1+8 = 0
6/x+36*x^-1-1+8 = 0
42*x^-1 = -7 // : 42
x^-1 = -1/6
-1 < 0
1/(x^1) = -1/6 // * x^1
1 = -1/6*x^1 // : -1/6
-6 = x^1
x = -6
x = -6
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