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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)
6/x-2/x-6+6 = -24/(x^2)-36 // + -24/(x^2)-36
6/x-2/x-(-24/(x^2))-6+6+36 = 0
6/x-2/x+24*x^-2-6+6+36 = 0
4*x^-1+24*x^-2+36 = 0
t_1 = x^-1
24*t_1^2+4*t_1^1+36 = 0
24*t_1^2+4*t_1+36 = 0
DELTA = 4^2-(4*24*36)
DELTA = -3440
DELTA < 0
x belongs to the empty set
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