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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x^3-((12*x)/x)-6 = 0
2*x^3-12-6 = 0
2*x^3 = 18 // : 2
x^3 = 9
x^3 = 9 // ^ 1/3
x = 9^(1/3)
x = 9^(1/3)
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