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D( x )
6*x^12 = 0
6*x^12 = 0
6*x^12 = 0
6*x^12 = 0 // : 6
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
(24*x^2*x^3)/(6*x^12) = 0
4*x^-7 = 0 // : 4
x^-7 = 0
x naleu017Cy do O
x belongs to the empty set
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