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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^8+(x^5)/x = 0
x^8+x^4 = 0
t_1 = x^4
1*t_1^2+1*t_1^1 = 0
t_1^2+t_1 = 0
DELTA = 1^2-(0*1*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-1)/(1*2) or t_1 = (-1^(1/2)-1)/(1*2)
t_1 = 0 or t_1 = -1
t_1 = -1
x^4+1 = 0
1*x^4 = -1 // : 1
x^4 = -1
t_1 = 0
x^4+0 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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