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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
54*x^(-1/3)-6 = 0
54*x^(-1/3) = 6 // : 54
x^(-1/3) = 1/9
-1/3 < 0
1/(x^(1/3)) = 1/9 // * x^(1/3)
1 = 1/9*x^(1/3) // : 1/9
9 = x^(1/3)
x^(1/3) = 9 // ^ 3
x = 729
x = 729
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