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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)
5/x-(10/(x^2))-5 = 0
5/x-10*x^-2-5 = 0
5*x^-1-10*x^-2-5 = 0
t_1 = x^-1
5*t_1^1-10*t_1^2-5 = 0
5*t_1-10*t_1^2-5 = 0
DELTA = 5^2-(-10*(-5)*4)
DELTA = -175
DELTA < 0
x belongs to the empty set
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