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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)
2/x-(3/x)-2+2 = -10/(x^2)-4 // + -10/(x^2)-4
2/x-(3/x)-(-10/(x^2))-2+2+4 = 0
2/x-3*x^-1+10*x^-2-2+2+4 = 0
10*x^-2-x^-1+4 = 0
t_1 = x^-1
10*t_1^2-1*t_1^1+4 = 0
10*t_1^2-t_1+4 = 0
DELTA = (-1)^2-(4*4*10)
DELTA = -159
DELTA < 0
x belongs to the empty set
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