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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
6-(48/(x^3)) = 0
6-48*x^-3 = 0
-48*x^-3 = -6 // : -48
x^-3 = 1/8
-3 < 0
1/(x^3) = 1/8 // * x^3
1 = 1/8*x^3 // : 1/8
8 = x^3
x^3 = 8 // ^ 1/3
x = 2
x = 2
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