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