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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)
(2*x-12)/(x^4) = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x = 6
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