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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x-1)*(x-2))/x+3 = 0
((x-1)*(x-2))/x+(3*x)/x = 0
(x-1)*(x-2)+3*x = 0
x^2+2 = 0
(x^2+2)/x = 0
(x^2+2)/x = 0 // * x
x^2+2 = 0
1*x^2 = -2 // : 1
x^2 = -2
x belongs to the empty set
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