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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x-24)/(x^4) = 0
8*x-24 = 0 // + 24
8*x = 24 // : 8
x = 24/8
x = 3
x = 3
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