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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^6+(x^3)/x = 0
x^6+x^2 = 0
t_1 = x^2
1*t_1^3+1*t_1^1 = 0
t_1^3+t_1 = 0
t_1*(t_1^2+1) = 0
1*t_1^2 = -1 // : 1
t_1^2 = -1
t_1 = 0
t_1 = 0
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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