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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-8/x = 4-24/x // - 4-24/x
-8/x-(-24/x)-4 = 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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