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D( x )
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(27*x^6-(12*x^5))/(3*x^2) = 0
(27*x^6-12*x^5)/(3*x^2) = 0
27*x^6-12*x^5 = 0
3*x^5*(9*x-4) = 0
9*x-4 = 0 // + 4
9*x = 4 // : 9
x = 4/9
3*x^5*(x-4/9) = 0
(3*x^5*(x-4/9))/(3*x^2) = 0
( 3*x^5 )
3*x^5 = 0 // : 3
x^5 = 0
x = 0
( x-4/9 )
x-4/9 = 0 // + 4/9
x = 4/9
x in { 0}
x = 4/9
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