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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)/(x^2)+2 = 0
x+2 = 0 // - 2
x = -2
x = -2
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