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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-8/x = -24/x-4 // + -24/x-4
4-8/x-(-24/x) = 0
24*x^-1-8/x+4 = 0
16*x^-1 = -4 // : 16
x^-1 = -1/4
-1 < 0
1/(x^1) = -1/4 // * x^1
1 = -1/4*x^1 // : -1/4
-4 = x^1
x = -4
x = -4
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