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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)
x^3-((6*x^3)/(x^3)) = 19 // - 19
x^3-((6*x^3)/(x^3))-19 = 0
x^3-19-6 = 0
1*x^3 = 25 // : 1
x^3 = 25
x^3 = 25 // ^ 1/3
x = 25^(1/3)
x = 25^(1/3)
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