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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x^2-(((x^3)/6)/x) = 0
6*x^2+(-1/6)*x^2 = 0
35/6*x^2 = 0 // : 35/6
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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