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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(6*x*x^2*((x^2-1)/3))/(x-1) = 0
(6*x^3*(x^2-1))/(3*(x-1)) = 0
( 6*x^3 )
6*x^3 = 0 // : 6
x^3 = 0
x = 0
( x^2-1 )
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1}
x in { 0, -1 }
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