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