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