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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)
3/(x^2)-(3/x)+1 = 0
3/(x^2)-3*x^-1+1 = 0
3*x^-2-3*x^-1+1 = 0
t_1 = x^-1
3*t_1^2-3*t_1^1+1 = 0
3*t_1^2-3*t_1+1 = 0
DELTA = (-3)^2-(1*3*4)
DELTA = -3
DELTA < 0
x belongs to the empty set
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