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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(x^2)-(8/x)+20 = 0
1/(x^2)-8*x^-1+20 = 0
x^-2-8*x^-1+20 = 0
t_1 = x^-1
1*t_1^2-8*t_1^1+20 = 0
t_1^2-8*t_1+20 = 0
DELTA = (-8)^2-(1*4*20)
DELTA = -16
DELTA < 0
x belongs to the empty set
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