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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(9*x^3+27*x^2)/(x+3) = 0
9*x^3+27*x^2 = 0
9*x^2*(x+3) = 0
x+3 = 0 // - 3
x = -3
9*x^2*(x+3) = 0
9*x^2 = 0
9*x^2 = 0 // : 9
x^2 = 0
x = 0
x = 0
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